LSTclock: sidereal time clock 4+

Local sidereal time clock

Tsuyoshi Sawada

Designed for iPad

    • 3.5 • 2 Ratings
    • Free


LSTclock is an iOS/iPadOS/watchOS app to display the local sidereal time (LST) at the selected location(s). On iOS/iPadOS, it can also calculate the LST and the Julian Date for arbitrary date/time. The app contents (location list) can be synced between iPhone and paired Apple Watch(es).

What’s New

Version 5.1

- Added a functionality to import locations from "Maps" app via "Share" sheet (iOS/iPadOS 14+).
- Supported multiple windows (iPadOS).

Ratings and Reviews

3.5 out of 5
2 Ratings

2 Ratings

jjts2703 ,


Essential app for amateur astronomers. It is simple and to the point. Thank you so much.

Thomas Observatory ,

No Night Mode

No Night mode, I.e dim red light

Developer Response ,

Thank you for the feedback. Night mode is added in version 3.5 (I hope it helps).

App Privacy

The developer, Tsuyoshi Sawada, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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