CompareOpen in App StoreApp info
- Category
- Navigation
- Age rating
- 4+
- Price
- 7.99 USD
- Version
- 2.5
- Released
- Aug 29, 2020
- Last updated
- 21 Sept 2026
- Size
- 25.7 MB
- Requires
- iOS 17.6 or later
- Languages
- 1
★★★★★
Average rating on the App Store. Apple doesn't publish how many ratings each star has.
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Rankings
Where this app stands in Georgia, updated 15 Oct 2026
Top free
Not in this chart today
Top paid · All apps and games
#32 ▼11
- Top paid · All apps and games
Show as table
| Date | Paid |
|---|---|
| 15 Oct 2026 | #32 |
| 14 Oct 2026 | #21 |
| 13 Oct 2026 | #10 |
Top 10 countries
Best rank in each country today. Click a country to see its graph.
What's newin version 2.5
Tested with iOS 27.1, now compatible with iPad and Mac Catalyst
About this app
Read full description
Using the U.S. Naval Observatory NOVAS library and solar system ephemerides from JPL, high precision positions can be calculated in real-time from 1900 to 2050. Simply select date and time and all values are recalculated instantly. The estimated elevation value is only needed for calculating sunrise/sunset, twilight, and moonrise/moonset. The app provides the following functionalities: *Aries: GHA position *Sun: -GHA/dec - Astronomical dawn, nautical dawn, civil dawn, sunrise, sunset, civil dusk, nautical dusk, astronomical dusk, and meridian passage at Greenwich. - Semidiameter - Sunlight world map with the Sun and the Moon position. *Moon: - GHA/dec - Moonrise/moonset and meridian passage at Greenwich. - Semidiameter - Moon phase and age of the Moon. *Planets: - GHA/dec for Venus, Mars, Jupiter, and Saturn. *Stars: - Magnitude, SHA/dec of 99 stars ordered by SHA. *Corrections: - Correction for the atmospheric refraction. - Correction for the dip of the horizon. - Parallax correction for the Moon, the Sun, Venus, and Mars.