# Astrolabe Clock

> Reference

Canonical page: [https://chrome-stats.com/d/id421777015](https://chrome-stats.com/d/id421777015)

## Overview

- **ID:** `id421777015`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** TwoNineEight Software
- **Category:** Reference
- **Rating:** 4.70 / 5 (49 ratings)
- **Version:** 2.0.3
- **Last updated:** 2026-05-18
- **First published:** 2011-03-01
- **Size:** 3.21 MB
- **Data as of:** 2026-09-21
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/astrolabe-clock/id421777015)
- **Website:** [http://www.TwoNineEightSoftware.com](http://www.twonineeightsoftware.com/)
- **Privacy policy:** [https://www.twonineeightsoftware.com/astrolabe-clock/](https://www.twonineeightsoftware.com/astrolabe-clock/)

## Description

Astrolabe Clock is an astronomical clock inspired by the astrolabe, an ancient astronomical instrument used to tell time and to predict the location of the Sun, stars and planets. This modern interpretation gives a view of the sky showing at a glance the time of day, day of year, and the location in the sky of the Sun, Moon, planets and stars. Astrolabe Clock also gives the time of sunrise and sunset, the phase of the Moon, transit times for the Sun, Moon, planets and stars, and can be used to show the occurrence of solar and lunar eclipses.

## Rankings

- #175,449 — Overall

## Review summary

Astrolabe Clock is praised as a free, lightweight tool with accurate solar/lunar visuals and a user-friendly drag‑time interface, making it a valuable educational gateway and quick reference. However, it faces significant performance and compatibility issues on current iOS, a lack of updates, and missing features like alarms, which temper enthusiasm for some users.

### Pros

- Free to use with a clean, intuitive UI.
- Accurate visualization of solar and lunar positions and elevations.
- Educational and a great gateway to astronomy and geometry.
- Simple, efficient, quick to learn and use for quick looks.
- Drag-the-time feature to view the sky at any date/time (past or future).

### Cons

- Extremely poor performance on latest iOS; hasn’t been updated in over 4 years.
- Laggy responsiveness on recent iOS versions (e.g., zooming and tapping planets).
- Date and time settings don’t stay current and often revert to old values.
- Lack of alarm/notification features; missing a requested capability.
- Compatibility and update concerns on newer iOS versions and App Store availability.

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Source: [Chrome-Stats](https://chrome-stats.com/d/id421777015)