iPad Screenshots


You don't need to invent the time machine to send yourself back in time! "Sagan Calendar" tells about the evolution of the Universe, galaxy formation, the birth of life on Earth.

★ Over 20 magnificent 3D models
★ High quality photo and video
★ Detailed description of each scene
★ Interesting cases
★ Language: English, Russian

The app based on the famous book "The Dragons of Eden" by an American astrophysicist and science popularizer Carl Sagan. He created a scale in which the lifetime of the Universe is mapped onto a single year. There are almost 475 years per second at this scale.

By moving along the timeline you will take an extraordinary journey to the past and will see the most remarkable scenes of history of the Universe from the Big Bang to skyscrapers construction!
All the scenes have pictural descriptions; there are a lot of photo, video and 3D materials related to corresponding scenes.

The most important stages of the Universe history are presented in the app: Bing Bang, galaxies and Solar System formation, Milky Way Galaxy, origin of life on the Earth, atmosphere formation, first photosynthetic organisms, eukaryotes and worms, fish and insects, animals and amphibians, trees, reptiles, dinosaurs, mammals, birds, plants, flowers, primates, hominids, humans, skyscrapers and others!

★VIDEO: http://youtu.be/XZWwFtrfEOo

★FACEBOOK: http://www.facebook.com/oscteam.llc

★TWITTER: https://twitter.com/OSCteam_LLC

What’s New

Version 1.0.1

Cross Banner bug fixed

Ratings and Reviews

4.3 out of 5
12 Ratings
12 Ratings
TravisAK ,


Have any of you reviewers actually read or watched Sagan?? "Shame on you Sagan?"..... Ha has been dead for nearly 20 years. I guarantee he had nothing to do with this app. And his original Cosmic calendar was based on a year, with Jan 1 being the Big Bang and some time near the end of Dec 31 we arrived. If you are going to trash someone as great as Carl at least do your homework. This is not a review of the app itself.

AstroPaul ,

Could have been a contender!

Great idea--the old Sagan history of the universe but in a year. Wasn't Sagan's in a day?!!

In any event, only a few entries... Locked events, must pay to see. Ones that are there are not that Informative. Cryptic settings with no help or explanation system.


Neetha 255 ,

Useless! Don't buy. A scam

A waste of money. Shame on you Sagan


Online Science Classroom, LLC
48.5 MB
Requires iOS 4.3 or later. Compatible with iPad.
English, Czech, Dutch, French, German, Italian, Japanese, Korean, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Traditional Chinese, Turkish
Age Rating
Rated 4+
© Online Science Classroom LLC
In-App Purchases
  1. Full version $1.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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