sábado, 28 de setembro de 2013


Amigos do blog Ad Astra ...dentro em breve estarei retornando as atividades neste local.
Por diversos motivos não pude continuar com o meu trabalho neste espaço de divulgação científica, espero que logo consiga rever vcs com novidades e mais disponibilidade.

Muito obrigado a vcs pelo carinho e amizade, acreditem mesmo não tendo sido postadas algumas notícias durante longo tempo as visitas esporádicas continuaram...foram mais de 30 mil desde a sua abertura.


Vamos em frente.


terça-feira, 5 de junho de 2012






External links

The next transit of Venus, when the planet Venus will appear as a small, dark disk moving across the face of the Sun, will begin at 22:09UTC on 5 June 2012, and will finish at 04:49 UTC on 6 June.[1] Depending on the position of the observer, the exact times can vary by up to ±7 minutes. Transits of Venus are among the rarest of predictable celestial phenomena and occur in pairs eight years apart:[2] theprevious transit having been in June 2004, the next pair of transits will not occur until December 2117 and December 2125.


The entire transit will be visible from the western Pacific Ocean, northwesternmost North America, northeastern Asia, Japan, thePhilippines, eastern AustraliaNew Zealand, and high Arctic locations including northernmost Scandinavia, and Greenland.[3] In North America, the Caribbean, and northwestern South America, the beginning of the transit will be visible on 5 or 6 June until sunset. From sunrise on 6 June, the end of the transit will be visible from South Asia, the Middle Easteast Africa and most of Europe. It will not be visible from most of South America or western Africa.


The 2012 transit will give scientists a number of research opportunities. These include:[4][5][6]
  • Measurement of dips in a star's brightness caused by a known planet transiting a known star (the Sun). This will help astronomers when searching for exoplanets. Unlike the 2004 Venus transit, the 2012 transit occurs during an active phase of the 11-year activity cycle of the Sun, and is likely to provide practice in detecting a planet's signal around a "spotty" variable star.
  • Measurement of the apparent diameter of Venus during the transit, and comparison with its known diameter. This will give information on how to estimate exoplanet sizes.
  • Observation of the atmosphere of Venus simultaneously from Earth-based telescopes and from the Venus Express spacecraft. This will give a better opportunity to understand the intermediate level of Venus's atmosphere than is possible from either viewpoint alone, and will provide new information about the climate of the planet.
  • Spectrographic study of the atmosphere of Venus. The results of analysis of the well-understood atmosphere of Venus will be compared with studies of exoplanets with atmospheres that are unknown.
  • The Hubble Space Telescope will use the Moon as a mirror to study the light reflected from Venus to determine the makeup of its atmosphere. This may provide another technique to study exoplanets.


The safest way to watch a transit is to observe an image of the Sun projected onto a screen through a telescopebinoculars, pinhole[7] or reflected pinhole.[8] The event can be viewed without magnification using filters specifically designed for this purpose, such as an astronomical solar filter or eclipse viewing glasses coated with a vacuum-deposited layer of chromium. However, the disk of Venus is tiny compared to the sun and not much will be seen. The once-recommended method of using exposed black-and-white film as a filter is not considered safe now, as small imperfections or gaps in the film may permit harmful UV rays to pass through. Observing the Sun directly without appropriate protection can damage or destroy retinal cells, causing temporary or permanent blindness.[9][10][11]
NASA is airing a live webcast of the transit from Mauna KeaHawaii.[12

quarta-feira, 16 de maio de 2012

2 - EMERALD OBSERVATORY for iPad - U$0,99

APPs Astronômicos


Amigos astrônomos, seguidores do blog ou apenas curiosos de passagem, boa tarde.

Para aqueles que ainda não conhecem os ótimos produtos da EMERALD SEQUOIA apresento o primeiro deles.


Utilizando apenas de uma excepcional apresentação, padrão relojoaria, consegue reunir TODAS AS IFORMAÇÕES, EFEMÉRIDES, necessárias para aqueles que as necessitam.




The Emerald Observatory app for iPad from Emerald Sequoia LLC is a clock and so much more. In addition to the 12-hr and 24-hr analog time, you can see a heliocentric orrery (display of planets in orbit around the sun) and their rise/set times and altitude and azimuth. You can determine the beginning and ending of civil, nautical and astronomical twilight, the “golden hour” when the sun is 15 degrees above the horizon and the light is generally best for outdoor photography, the equation of time, leap years, and a time zone indicator. The inner subdials show UTC, sidereal, and solar time. There’s also a photographic representation of the lunar phase and apparent size, and a geochron-type display of the earth’s daytime and night areas. This information can be displayed for the current location or for any entered location and for the current time (as synchronized via NTP) or any time from 4000 BCE through 2800 CE. You can set the program to be always on for a beautiful clock display. The Emerald Observatory app is $0.99 from iTunes.

REVIEW: Great deal for the money
I have to agree with everyone else. This app is worth the money. Very accurate (atomic sync) and attractive face. My IPad's time is off by a little sometimes, but this clock is always dead-on.

Look this...


terça-feira, 15 de maio de 2012


Quase tudo pronto para a próxima Star Party, o grupo já está reunido mas...

Está faltando exatamente aquele companheiro que conhece o caminho e o endereço do local escolhido para o encontro.

Ok!  Poderíamos usar o GPS, Google Maps, mas gostariamos de poder observar o local antes...
Não se preocupem mais !

Este interessante SITE ajudará aqueles que o escolherem.

Show My Street é um serviço online que serve para localizar rapidamente um endereço pela internet.

Você irá se surpreender com a rapidez com que o site encontra um endereço em qualquer lugar do planeta.

Basta você digitar o nome da rua e a cidade que você quer encontrar e pronto!
E caso a rua/cidade que você encontrar já esteja disponível no modo Street View do Google Maps, você poderá ver uma imagem conforme abaixo.

Experimente pela sua rua.

1 - STAR WALK for iPad - U$ 4,99

APPs Astronômicos

STAR WALK - Astronomy Guide.

Star Walk - 5 Stars Astronomy Guide Review

Explore the universe from your iPhone or iPod touch

[Editor's Note: This review assesses version 3.6.1 of Star Walk. Version 4.0 was released after this review was published.]
I have a soft spot for any science-related app out there, but my favorite thing about owning an iPhone and iPod touch is playing with all theastronomy-themed apps from the App Store. I have a few of them on my phone, including some I’ve reviewed. There are so many things to explore in our universe, and many apps can help you get started.
One such app is the $2,99  ($4,99 for iPad) Star Walk, an educational planetarium app fromVito Technologies aimed at both kids and adults. The app launches with the Sky Live screen, which shows you the Sun, the Moon, Venus, Mars, Jupiter, and Saturn. The screen shows when the Sun and each of those planets rises and sets, as well as the elevation angle of each of those objects. For the Moon, it shows the current phase. Tap on one of the arrow buttons on the bottom left or right of the screen, and the date in the upper right corner changes to the previous or next day, depending on which direction you choose. As you cycle through the days, you can see the Moon phases change and the information for the other objects featured on the screen change as well.

Big Blue Marble: The 3D globe in Star Walk gives you a real-time view of Earth from space. Your current location appears on the globe, and you can see your location’s latitude and longitude.
To escape the Sky Live screen, tap the X button in the upper left. You’ll see a sky view of the stars and other celestial objects. Four buttons occupy each corner of the screen: a bear-paw-shaped button in the upper left, a clock button in the upper right, a magnifying-glass (or search) button in the lower left, and another bear-paw-shaped button in the lower right. (Before getting into the various functions of the buttons, there’s fun news about this app for iPhone 3GS owners: Tilt your iPhone skyward, and you’ll activate the Star Spotter view, which shows you what you are looking at in the sky from where you are at the time. This is a great way to learn about the universe in a more interactive and realistic way, instead of just abstractly by tapping buttons on screen to give you more information about an object that may not be relevant in relation to your position on Earth. To deactivate this mode, touch the screen again. The Star Spotter mode, which relies on the GPS capabilities of the 3GS, doesn’t work on the original iPhone, iPhone 3G, or iPod touch.)
When tapped, the bear-paw button in the upper left of the screen gives you two choices: you can either go back to the Sky Live screen or go to information about the app, contained in five concise screens. I recommend reading through them to get an idea of how to navigate the app. Having said that, I will gladly acknowledge that the app is very intuitive, and you can figure out how to navigate it just by playing around with it.
The magnifying-glass (or search) button in the lower left of the screen flips the screen over when pressed and displays four choices for you at the bottom: you can choose to view constellations, the Solar System, Messier objects, or stars. You can also search for objects through the search box. This box is handy, especially if you know how to spell the object you’re looking for, but I’d also like to see an alphabet listing somewhere on screen so I could choose a letter and be taken immediately to the various objects that begin with the letter I choose. I can currently type a B in the search box to get to all the star names beginning with “b,” for instance, but I also get star names that have the letter B somewhere in their name. Having a more precise way to get to objects would save users time.
One cool thing about the search feature in this app, though, is that you can type a name or letter in the search box, and notification badges will appear next to Constellations, Solar System, Messier, or Stars that denote the number of items in each category that match your search.
When you choose an object from a list, be it a constellation, a planet or object in the Solar System, a Messier object, or a star, the screen flips again and shows either the object name in green or the object itself circled in a green, animated circle. Tap on the info (i) button in the upper left to get more information about the object. A lot of the objects have very little information beyond just their names, but you can tap on the W button in the information box to go to the Web (a Wikipedia page) to find out more about an object. While not available in every information box, the W button worked seamlessly for each object I tested. The only drag about choosing to go to the Web is that you leave the Star Walk app and launch the mobile Safari browser, with no easy way to get back to Star Walk for continuing your discoveries. An update that Vito Technologies is working on now, version 4.0, makes the information about each object more detailed from within the app itself, thus limiting the the number of instances you need to go to Wikipedia. The new version is not yet available on the App Store, but I’ve seen a preview and can say the changes improve the app.
Also, some of the names of objects you can choose are listed in white or grayed out. Don’t be fooled, though; you can click on the grayed-out ones and still get information about them. There seems to be no rhyme or reason as to why some names are grayed out and others are in white.

Gotta Go Back in Time: The Time Machine feature in Star Walk lets you track an object as time goes by. It’s a great way to see how Neptune, for instance, travels in relation to Earth and the Sun along its orbital path.
After trying out the info button, you can tap on the clock button in the upper right to reveal the Time Machine. That shows the current date and time. Flick upward on the Time Machine timeline, and you can view the object of your choice the way it appears at various points in time. This is really cool for seeing how Venus, for example, travels on its orbital path in relation to Earth and the Sun as time goes by. You can speed up or slow down the rate of the Time Machine. This feature is pretty sensitive, though, so you’re more likely to have to slow it down than speed it up. Tap on it to stop it. You should see the word now next to the date and time display. Tap it to return to the current day and time.
When you’ve finished learning about an object, tap on the magnifying-glass icon again to take you back to the list of objects you chose from. If you’re finished looking at objects altogether, tap the Done button. The problem with doing this, though, is that you’re taken to the screen of the object you just learned about, with an info button in the upper left instead of the original screen’s bear-paw button. To get back to the original screen, you need to tap the other bear-paw button in the lower right, tap the globe button, tap the constellation button in the lower left of the 3D globe screen you just loaded, and then you’re back to home base, as it were. An easier way to get back to the original screen would be much appreciated, in case a user wants to reference the app’s Sky Live or information screens. Luckily, this problem will be tackled in the version 4.0 update.
Speaking of the 3D global view of Earth—it’s awesome. There are a few apps I know of with a similar type of globe view of Earth: The free Planetsand Google Earth have one. What makes the one in Star Walk different is that it takes you from the perspective on Earth as you look at the sky to the perspective of space as Earth is seen from it. The effect in Star Walk is neat—it’s one I repeatedly invoke just for fun. You can also turn the globe by using various finger gestures.
You can have the app read your location automatically (an option you choose the first time you launch the app), or you can set a location yourself. It would be nice if the app asked to use your current location each time you launched Star Walk, or at least gave you the option to turn it off. You can tap the magnifying-glass button in the 3D globe view to get a list of cities around the globe in order of their distance from your current location. But if you set a location somewhere in Argentina, for instance, the distance measurement for the cities listed is still the distance from your current location, not the distance from the new location in Argentina that you chose.
Accessing information through the buttons on screen isn’t the only method you need employ. You can just tap on screen anywhere and the object will be surrounded by the green, animated circle I mentioned earlier; then you can tap the info button to learn more about it.
There are other useful and neat features you can access through the bottom right bear-paw button: the tools menu lets you set options, one of which includes a night-vision mode; and a book button takes you to a screen on which you can view a picture of the day or create bookmarks to your favorite space object. You can even e-mail bookmarks to people. When I tested this, however, I got strange results. I opened the e-mail on my iPhone. When I tapped on the name of the bookmark in the e-mail, Star Walk started to launch but then quit, and I was taken back to my iPhone’s main screen. When I tapped on the Open Bookmark In Star Walk link, my phone tried to connect to the App Store but failed. (When I connected to the App Store through the App Store app, however, I connected without a problem.) From my desktop, the Open Bookmark In Star Walk link brought me to the App Store page for it in iTunes. The e-mail also contains a picture of the object you sent.
Normally, I’m not fond of the sounds built in to various apps, but the sounds in Star Walk are exciting. They remind me of the sounds coming from The Enterprise computer helms in Star Trek: The Next Generation,but the sounds go a step further than that. When I use the app with the sounds on, I feel as though I’ve finally entered into the future promised by all the great science-fiction novels and movies I’ve enjoyed in my lifetime so far. I become rather elated as I tap buttons in this app. In the tools menu, you can turn the sound off if you prefer, and adjust its volume.
Star Walk is a great planetarium app. It has a few wrinkles, but the developers are making the following updates to the app in the forthcoming version 4.0: tweaking the Sky Live screen to be more descriptive of what you see on it (such as naming the planets shown instead of leaving you to figure it out for yourself); changing the on-screen buttons to fix the problem I mentioned earlier about not currently having an easy way to get back to the Sky Live screen; adding more information in the app itself about objects; and tweaking the Time Machine feature a bit.
I recommend this app for anyone interested in learning more about objects in space and Earth’s relation to them. And the app is intuitive enough for kids to easily navigate. For $3, you get the universe in your pocket. So get outside and see what you’ve been missing.
[I mentioned in the review that there seemed to be no rhyme or reason as to why some names of objects were grayed out and others weren't. I have since learned that there is, indeed, a rhyme and reason to it. A kindly reader pointed out that the grayed-out object names are those that are not visible from your current location. However, as I mentioned, you can still access information about the grayed-out items through the app.]