--- title: "LSTclock: sidereal time clock - Reviews, Revenue and Downloads in United States | Apple App Store" description: "LSTclock is an iOS/iPadOS/watchOS app that displays the local sidereal time (LST) at registered location(s). On iOS/iPadOS, it can also calculate LST and Julian Date for any date and time. The list " --- # LSTclock: sidereal time clock — United States > Local sidereal time clock ![LSTclock App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/9c/fa/9f/9cfa9fec-c019-f44c-67fe-b9434ef6ba8a/LSTclockIcon-0-0-1x_U007epad-0-1-sRGB-85-220.png/434x0w.png) **Developer:** [Tsuyoshi Sawada](https://apptail.io/developer/tsuyoshi-sawada-TDrc) **Category:** Utilities **Rating:** 3.8/5 (10 ratings) **Price:** Free **Bundle ID:** com.tanusouth.LSTclock **Store:** Apple App Store **Country:** United States **Version:** 9.4 (released 2026-07-07) **Original Release:** 2020-04-26 **Languages:** English **App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id1510148631) **AppTail Page:** [https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/united-states](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/united-states) ## LSTclock Description LSTclock is an iOS/iPadOS/watchOS app that displays the local sidereal time (LST) at registered location(s). On iOS/iPadOS, it can also calculate LST and Julian Date for any date and time. The list of locations can be synced between iPhone and paired Apple Watch(es). ## LSTclock Screenshots - [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/aa/56/29/aa56291e-96f4-59bd-97cd-7a7704783c40/iPhone_6.5_main.png/1284x2778.png) - [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/d3/aa/38/d3aa38e9-c01f-aedc-acc6-1d03ba97983c/iPhone_6.5_main_dark.png/1284x2778.png) - [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/e2/dd/6b/e2dd6b07-600f-0bab-07d7-bc6e26419410/iPhone_6.5_main_night.png/1284x2778.png) - [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/7b/a4/6c/7ba46cf1-c567-02cb-f256-65cf676f05b3/iPhone_6.5_choosedatetime.png/1284x2778.png) - [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/2d/4e/33/2d4e3383-82fd-3e09-2431-b7755f91a9ff/iPhone_6.5_preferences.png/1284x2778.png) - [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/cd/ac/a7/cdaca70b-9e64-2042-427a-32bfb8dbc14e/iPhone_6.5_newlocation.png/1284x2778.png) - [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/7b/74/02/7b74025b-a2d9-aea0-05e1-ac7be9375ad4/iPhone_6.5_chooselocation.png/1284x2778.png) - [Screenshot 8](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/2f/9e/81/2f9e812a-ba16-4c72-b2be-d51cd5f8861b/iPhone_6.5_widget.png/1284x2778.png) ## LSTclock Rating Breakdown in United States - 5 stars: 6 (60%) - 4 stars: 0 (0%) - 3 stars: 1 (10%) - 2 stars: 2 (20%) - 1 stars: 1 (10%) ## LSTclock Reviews in United States ### ***** "Almost; but, not quite." Astronomers often need to use standard and local sidereal time which is done in the app; but more importantly for record keeping, they also need Julian and Modified Julian Dates. The app does not show JD or MJD and really needs to do this to be useful and bumped from three to five stars. Having to go to settings for time (which is not self explanatory) in order to get the JD and MJD is a pain. Just display both under the LST. Hope the developer takes this under advisement. 14 December 2024 UPDATE: Tsuyoshi Sawada quickly responded with a note through the Apple App store that he added an optional setting to switch on or off the JD/MJD in his LSTClock and I tested it this evening when making my observations. It is a perfect solution to a long term issue that I have struggled with in my work having to look things up and compute JD and MJD with online calculators. Tsuyoshi, your solution is perfect! Thank you for responding so quickly and as promised, your app is not rated ⭐️⭐️⭐️⭐️⭐️ and more. Thank you so very much! -- Universe Observer, 2024-12-15 ### *---- "Widget broken" Widget in iOS 18 still broken. -- jjts2703, 2024-11-21 ### ***-- "Extreme minimalism" The app works but I can’t seem to get the Lock Screen widget to show the LST. It shows a time when selecting the widget as a preview, but not on the active Lock Screen widget itself. I’ve tried all the privacy/notification settings I could find, updated iOS and reinstalled. The app doesn’t show up in some lists where other app settings would appear. -- Mockspiral, 2023-05-12 ### **--- "“Local” sidereal time" In relationship to my actual location, it’s not showing me accurate side real time. It’s showing me side real time for Switzerland, but I’m not in Switzerland. I have my location on, but it’s not telling me what my local sidereal time is -- no when you know, 2023-04-19 ### ***** "Small bugs but unique in function" There seems to be a bug in how the Watch app enumerates complications, and took a few restarts and resets before I could get everything just right, but this app is unique in that you can get sidereal time with just your longitude and display it on the watch face. -- PHILIHP BUSBY, 2022-12-11 ### **--- "No Night Mode" No Night mode, I.e dim red light -- Thomas Observatory, 2021-07-16 [View all LSTclock reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews) ## LSTclock Discovered Keywords - sidereal - chronopics - lstclock - sidereal time clock ## Apps Similar to LSTclock - [Polar Scope Align Pro Watch](https://apptail.io/app/polar-scope-align-pro-watch-mtO/united-states) - [Local Sidereal Time](https://apptail.io/app/local-sidereal-time-IWQ/united-states) - [Julianator](https://apptail.io/app/julianator-VNNb/united-states) - [iOptron Commander (iOS)](https://apptail.io/app/ioptron-commander-ios-bgSb/united-states) - [MAX Tageslicht](https://apptail.io/app/max-tageslicht-Ptqc/united-states) - [Desktop Astro Clock](https://apptail.io/app/desktop-astro-clock-LCUc/united-states) - [@Beat: Internet time](https://apptail.io/app/at-beat-internet-time-iqte/united-states) - [Bubble Level + Compass](https://apptail.io/app/bubble-level-compass-WIIf/united-states) - [Custom Word Clock - TextTime](https://apptail.io/app/custom-word-clock-texttime-ESaq/united-states) - [Touch-N-Stars](https://apptail.io/app/touch-n-stars-cwvv/united-states) ## LSTclock Available In - [United States](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/united-states) - [Japan](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/japan) - [Australia](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/australia) - [Canada](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/canada) - [Singapore](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/singapore) - [Sweden](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/sweden) - [Hong Kong SAR China](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/hong-kong) - [France](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/france) - [Switzerland](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/switzerland) - [Chile](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/chile) - [China](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/china) - [Colombia](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/colombia) - [Cyprus](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/cyprus) - [Czechia](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/czechia) - [Germany](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/germany) - [Denmark](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/denmark) - [Dominican Republic](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/dominican-republic) - [Algeria](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/algeria) - [Ecuador](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/ecuador) - [Estonia](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/estonia) - [Egypt](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/egypt) - [Spain](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/spain) - [Finland](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/finland) - [United Kingdom](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/united-kingdom) - [Greece](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/greece) - [Croatia](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/croatia) - [Hungary](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/hungary) - [Indonesia](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/indonesia) - [Ireland](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/ireland) - [Israel](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/israel) - [India](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/india) - [Italy](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/italy) - [South Korea](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/south-korea) - [Kuwait](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/kuwait) - [Kazakhstan](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/kazakhstan) - [Lebanon](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/lebanon) - [Sri Lanka](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/sri-lanka) - [Lithuania](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/lithuania) - [Mexico](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/mexico) - [Malaysia](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/malaysia) - [Nigeria](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/nigeria) - [Netherlands](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/netherlands) - [Norway](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/norway) - [New Zealand](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/new-zealand) - [Peru](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/peru) - [Philippines](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/philippines) - [Pakistan](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/pakistan) - [Poland](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/poland) - [Portugal](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/portugal) - [Romania](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/romania) - [Russia](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/russia) - [Saudi Arabia](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/saudi-arabia) - [Slovenia](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/slovenia) - [Thailand](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/thailand) - [Türkiye](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/turkey) - [Ukraine](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/ukraine) - [Uzbekistan](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/uzbekistan) - [United Arab Emirates](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/united-arab-emirates) - [South Africa](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/south-africa) - [Angola](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/angola) - [Argentina](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/argentina) - [Austria](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/austria) - [Azerbaijan](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/azerbaijan) - [Belgium](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/belgium) - [Brazil](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/brazil) - [Belarus](https://apptail.io/app/lstclock-sidereal-time-clock-tSsc/belarus) --- ## About AppTail [AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. 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