Win iPhone App for Observing: TeleCalc

Screenshot from 'TeleCalc'

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There’s a new observing app for the iPhone, iPod and iPad, called TeleCalc. Enter in two data points about your telescope (aperture and focal ratio) and two about the eyepiece (focal length and diameter) the program calculates angular field of view, best eyepiece magnification, resolution (Dawes, Rayleight), exit pupil, limiting stellar magnitude and light gathering power.

TeleCalc is available in eight languages: English, Spanish, French, Italian, German, Portuguese, Russian and Japanese. Search “TeleCalc” in iTunes to download it or find it on the iTunes store.

Thanks to developer Fabio Rendelucci who has given Universe Today 3 free TeleCalc apps to give away.

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The first 3 people to answer the following question will be sent a code for a free TeleCalc app:

To find the magnifying power of any telescope, divide the focal length of the telescope by the focal length of the what other telescope piece?

Submit your answers in the “Comments”

Also, if you’re looking for more, take a look at all the apps that NASA has available for both iPhone and Android.

Nancy Atkinson

Nancy has been with Universe Today since 2004, and has published over 6,000 articles on space exploration, astronomy, science and technology. She is the author of two books: "Eight Years to the Moon: the History of the Apollo Missions," (2019) which shares the stories of 60 engineers and scientists who worked behind the scenes to make landing on the Moon possible; and "Incredible Stories from Space: A Behind-the-Scenes Look at the Missions Changing Our View of the Cosmos" (2016) tells the stories of those who work on NASA's robotic missions to explore the Solar System and beyond. Follow Nancy on Twitter at https://twitter.com/Nancy_A and and Instagram at and https://www.instagram.com/nancyatkinson_ut/