# Star Pupil

> Education

Canonical page: [https://chrome-stats.com/d/id6463496579](https://chrome-stats.com/d/id6463496579)

## Overview

- **ID:** `id6463496579`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Richard Craddock
- **Category:** Education
- **Rating:** 5.00 / 5 (1 ratings)
- **Version:** 1.0.5
- **Last updated:** 2023-09-11
- **First published:** 2023-09-06
- **Size:** 15 MB
- **Data as of:** 2026-09-26
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/star-pupil/id6463496579)
- **Website:** [http://cradware.com/star-pupil](http://cradware.com/star-pupil)
- **Privacy policy:** [https://www.cradware.com/privacy-policy/](https://www.cradware.com/privacy-policy/)

## Description

The best way to practice Celestial Navigation

Star Pupil is a practice aid for learning Celestial Navigation. It does not merely produce the answers to sight reductions but rather shows all the steps along the way!

Traditional Celestial Navigation is straightforward and requires only a Nautical Almanac, Sight Reduction Tables, and basic arithmetic. However each step must be performed correctly, and small errors, like adding rather than subtracting, are easy to make.

Star Pupil sharpens your traditional Celestial Navigation skills by showing each calculation and each step along the way for performing a Sight Reduction and plotting a Line of Position.

Star Pupil shows all the calculations and steps for:
* Calculating Ha from Hs using a Nautical Almanac
* Performing a sight reduction for the Sun and Planets using Pub 229
* Performing a sight reduction for Stars using either Pub 229 or Pub 249
* Plotting LOPs for the Sun, Planets, and Stars
* Plotting multiple LOPs to get a fix

Additionally, Star Pupil shows the steps for finding twilight at your position, and looking up the best stars for taking sights using Publication 249 Volume 1.

## Rankings

- #890,254 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6463496579)