Perpetual Nautical Almanac
RPA Technologies
Getting the latest details from the App Store…
RPA Technologies
Getting the latest details from the App Store…
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…
Top of Paid · Navigation in Australia. Perpetual Nautical Almanac is #18 there. Changes are over 7 days.
How the app presents itself on the App Store. Select a screenshot to open it full size.
Version 2.5 · 21 Sep 2026 · 19 days ago
Tested with iOS 27.1, now compatible with iPad and Mac Catalyst
Every chart this app is in right now, best position first.
| Chart | Rank | 24 h | 7 days | Best | Days on chart |
|---|---|---|---|---|---|
Higher on the chart is better: #1 is at the top.
| #18 |
| New entry |
| Change unknown |
| #18 |
| 1 |
Sign in to see 30 days, 90 days and all history.
Australia · Paid · Navigation: best #18, latest #18, over 6 snapshots since 8 Oct. No snapshots from 8 Oct to 9 Oct, on 9 Oct, and on 10 Oct; the line joins the snapshots on either side.
Entries, big moves, #1s and new versions we've recorded.
