# Perpetual Nautical Almanac

> Navigation

Canonical page: [https://chrome-stats.com/d/id1483007345](https://chrome-stats.com/d/id1483007345)

## Overview

- **ID:** `id1483007345`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** RPA Technologies
- **Category:** Navigation
- **Rating:** 5.00 / 5 (1 ratings)
- **Version:** 2.5
- **Last updated:** 2026-09-21
- **First published:** 2019-10-10
- **Size:** 26 MB
- **Data as of:** 2026-09-23
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/perpetual-nautical-almanac/id1483007345)
- **Privacy policy:** [http://www.rpatec.com/privacy-policy/?lang=en](http://www.rpatec.com/privacy-policy/?lang=en)

## 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.

## Rankings

- #868,534 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id1483007345)