About LSTclock: sidereal time clock
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...
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).
Version History - Added a functionality to set an alarm for calendar events created from the "Choose Date/Time" sheet (iOS/iPadOS). - Modified the layout of the Main screen (watchOS). - Added an option to hide UTC/JD/MJD on the Main screen (watchOS). - UI tweaks. 9.3 Mar 20 - Worked around the issue with "Share" from Maps app on iOS/iPadOS 26. - Added a functionality to set date/time in desired time zone on the "Choose Date/Time" sheet (iOS/iPadOS). As a side effect, settings for UTC display (show/hide and font size) are reset to the default values upon the update of the app (sorry for the inconvenience). - Assigned swipe-to-right gesture to edit existing locations (iOS/iPadOS). - UI tweaks. 9.2 Feb 21 - Improved darkness of the Night Mode. - Added an option to disable auto-locking (sleeping) while using the app (iOS/iPadOS). - Added a map type toggle on the "Search Results" sheet (iOS/iPadOS). - Added a functionality to edit existing locations by swiping to right (watchOS). - Bug fixes and UI tweaks. 9.1 Feb 7 - Dropped support for iOS/iPadOS 16 and watchOS 9 (sorry for the inconvenience). - Adapted to modern OS look & feel, including Liquid Glass and new icon. - Known issue on iOS/iPadOS 26: "Share" sheet from the Maps app does not work because of internal changes of the OS. In this version, the error message was improved to clarify the situation. - Bug fixes and UI tweaks. 9.0 Jan 28 - Modified widgets and complications in some sizes to reflect the "Show JD/MJD" (iOS/iPadOS) and "Display Item" (watchOS) preferences. As a side effect, these settings are reset to the default values upon the update of the app and you will have to set them again (sorry for the inconveniences). - Bug fixes and UI tweaks. 8.4 03/28/2025 - Added an option to show Julian Date / Modified Julian Date on the main screen. 8.3 12/08/2024 - UI tweaks. 8.2 12/03/2024 - Made widgets and complications fail-safe: if the chosen location no longer exists, the first location in the list is shown instead. - Changed the behavior of tapping on the LST list: the "Edit Location" sheet is opened by a tap on the name or longitude, while the "Choose LST" sheet is invoked by a tap on the LST if the clock is paused (iOS/iPadOS). - Bug fixes and UI tweaks. 8.1 11/24/2024 - Dropped support for iOS/iPadOS 15 (sorry for the inconvenience). - Added an option to toggle UTC display (iOS/iPadOS). - Added a functionality to display LST at 0:00 of the day (local time or UTC) by tap-and-hold on the "Play/Pause" button (iOS/iPadOS). - Improved privacy when adding events to Calendar: "Add Events Only", rather than "Full Access", is required (iOS/iPadOS 17+). - Supported dark and tinted icons (iOS/iPadOS 18). - Assigned long press of the "Preferences" button to toggle Night Mode (watchOS). - Supported double-tap gesture on Apple Watch Series 9/10 and Apple Watch Ultra 2 (watchOS 11). - Bug fixes and UI tweaks. 8.0 11/20/2024 - Dropped support for iOS/iPadOS 14 and watchOS 8. On watchOS, you may be forced to set up the app contents and complications again. Sorry for the inconveniences. - Supported StandBy widgets (iOS 17). - Supported Smart Stack widgets (watchOS 10). - UI tweaks. 7.0 10/09/2023 - Added an option to display LST in degrees. To show the switch for this option in watchOS, tap and hold on the "Night Mode" button. - Added an option for the preferred format of longitude: sexagesimal or decimal (iOS/iPadOS). - Added "Full Screen Mode", in which only the LST at a location is displayed (iOS/iPadOS). - Changed the format of LST in complications from decimal hours to hours:minutes (watchOS). - UI tweaks. 6.1 10/08/2022 - Dropped support for iOS/iPadOS 13 and watchOS 7 (sorry for the inconvenience). - Supported Lock Screen Widgets (iOS 16). - Added "Search" function in the "New/Edit Location" sheet (iOS/iPadOS). - Improved sync of the location list among multiple windows (iPadOS). - Various UI improvements and tweaks. 6.0 09/10/2022 - Enabled tap-to-toggle of the font size of the UTC display (iOS/iPadOS). 5.2 06/01/2022 - Added a functionality to import locations from "Maps" app via "Share" sheet (iOS/iPadOS 14+). - Supported multiple windows (iPadOS). 5.1 01/16/2022 - Improved watchOS complications: displaying current LST, supporting more complication families (watchOS). - Improved support for trackpad/mouse pointer (iPadOS 15). - Fixed the following issue: dropped pin in the "Choose Location" sheet was sometimes not recognized by the parent "Add/Edit Location" sheet (iOS/iPadOS). - Optimized the usage of the location service (iOS/iPadOS/watchOS). 5.0 12/13/2021 This update from Apple will improve the functionality of this app. No new features are included. - Supported the always-on display of Apple Watch Series 5-7 (watchOS 8). - Tweaks to adapt to Xcode 13. 4.0 09/25/2021 - Improved darkness of the "night vision" mode on iOS/iPadOS (caveat: due to technical reasons, some of the UI elements in the "Sheet" views remain bright). 3.6 07/26/2021 - Added "night vision" mode (iOS/iPadOS 14.5+ and watchOS). 3.5 07/19/2021 - Added a functionality to add events to calendar via the "Choose Date/Time" sheet (iOS/iPadOS). 3.4 02/28/2021 - Added a functionality to choose date/time based on LST (iOS/iPadOS). - Added buttons in the "Choose Date/Time" sheet to reset to the current date/time and to step backward/forward by one sidereal day (iOS/iPadOS). 3.3 02/22/2021 - Added a display of LST(s) in the "Choose Date/Time" sheet (iOS/iPadOS). 3.2 02/15/2021 - Supported configurable Widgets on iOS/iPadOS 14. Widgets created with older versions of the App will no longer work; please remove them and create new ones (sorry for the inconvenience). - Added support for the following watchOS complication families: "Extra Large", "Graphic Bezel", "Graphic Extra Large", and "Utilitarian Large". 3.1 10/24/2020 - Added support for Apple Watch (watchOS 7.0 or later). - Added tap-to-edit of existing locations in the list (iOS/iPadOS only). 3.0 10/03/2020 - Added support for iOS/iPadOS 14. Widget to display the current LST at the first location in the list can be placed on the Home screen. 2.0 09/18/2020 - Added a workaround for Japanese (and potentially some other languages) text input on the "New Location" sheet. - New icon. 1.5 07/12/2020
Previous Versions
Here you can find the changelog of LSTclock: sidereal time clock since it was posted on our website on 2023-09-07 09:06:19.
The latest version is 9.3 and it was updated on 2026-06-24 20:15:38. See below the changes in each version.
LSTclock: sidereal time clock version 9.3
Updated At: 2026-06-03
Changes: Version History - Added a functionality to set an alarm for calendar events created from the "Choose Date/Time" sheet (iOS/iPadOS).
- Modified the layout of the Main screen (watchOS).
- Added an option to hide UTC/JD/MJD on the Main screen (watchOS).
- UI tweaks. 9.3 Mar 20 - Worked around the issue with "Share" from Maps app on iOS/iPadOS 26.
- Added a functionality to set date/time in desired time zone on the "Choose Date/Time" sheet (iOS/iPadOS). As a side effect, settings for UTC display (show/hide and font size) are reset to the default values upon the update of the app (sorry for the inconvenience).
- Assigned swipe-to-right gesture to edit existing locations (iOS/iPadOS).
- UI tweaks. 9.2 Feb 21 - Improved darkness of the Night Mode.
- Added an option to disable auto-locking (sleeping) while using the app (iOS/iPadOS).
- Added a map type toggle on the "Search Results" sheet (iOS/iPadOS).
- Added a functionality to edit existing locations by swiping to right (watchOS).
- Bug fixes and UI tweaks. 9.1 Feb 7 - Dropped support for iOS/iPadOS 16 and watchOS 9 (sorry for the inconvenience).
- Adapted to modern OS look & feel, including Liquid Glass and new icon.
- Known issue on iOS/iPadOS 26: "Share" sheet from the Maps app does not work because of internal changes of the OS. In this version, the error message was improved to clarify the situation.
- Bug fixes and UI tweaks. 9.0 Jan 28 - Modified widgets and complications in some sizes to reflect the "Show JD/MJD" (iOS/iPadOS) and "Display Item" (watchOS) preferences. As a side effect, these settings are reset to the default values upon the update of the app and you will have to set them again (sorry for the inconveniences).
- Bug fixes and UI tweaks. 8.4 03/28/2025 - Added an option to show Julian Date / Modified Julian Date on the main screen. 8.3 12/08/2024 - UI tweaks. 8.2 12/03/2024 - Made widgets and complications fail-safe: if the chosen location no longer exists, the first location in the list is shown instead.
- Changed the behavior of tapping on the LST list: the "Edit Location" sheet is opened by a tap on the name or longitude, while the "Choose LST" sheet is invoked by a tap on the LST if the clock is paused (iOS/iPadOS).
- Bug fixes and UI tweaks. 8.1 11/24/2024 - Dropped support for iOS/iPadOS 15 (sorry for the inconvenience).
- Added an option to toggle UTC display (iOS/iPadOS).
- Added a functionality to display LST at 0:00 of the day (local time or UTC) by tap-and-hold on the "Play/Pause" button (iOS/iPadOS).
- Improved privacy when adding events to Calendar: "Add Events Only", rather than "Full Access", is required (iOS/iPadOS 17+).
- Supported dark and tinted icons (iOS/iPadOS 18).
- Assigned long press of the "Preferences" button to toggle Night Mode (watchOS).
- Supported double-tap gesture on Apple Watch Series 9/10 and Apple Watch Ultra 2 (watchOS 11).
- Bug fixes and UI tweaks. 8.0 11/20/2024 - Dropped support for iOS/iPadOS 14 and watchOS 8. On watchOS, you may be forced to set up the app contents and complications again. Sorry for the inconveniences.
- Supported StandBy widgets (iOS 17).
- Supported Smart Stack widgets (watchOS 10).
- UI tweaks. 7.0 10/09/2023 - Added an option to display LST in degrees. To show the switch for this option in watchOS, tap and hold on the "Night Mode" button.
- Added an option for the preferred format of longitude: sexagesimal or decimal (iOS/iPadOS).
- Added "Full Screen Mode", in which only the LST at a location is displayed (iOS/iPadOS).
- Changed the format of LST in complications from decimal hours to hours:minutes (watchOS).
- UI tweaks. 6.1 10/08/2022 - Dropped support for iOS/iPadOS 13 and watchOS 7 (sorry for the inconvenience).
- Supported Lock Screen Widgets (iOS 16).
- Added "Search" function in the "New/Edit Location" sheet (iOS/iPadOS).
- Improved sync of the location list among multiple windows (iPadOS).
- Various UI improvements and tweaks. 6.0 09/10/2022 - Enabled tap-to-toggle of the font size of the UTC display (iOS/iPadOS). 5.2 06/01/2022 - Added a functionality to import locations from "Maps" app via "Share" sheet (iOS/iPadOS 14+).
- Supported multiple windows (iPadOS). 5.1 01/16/2022 - Improved watchOS complications: displaying current LST, supporting more complication families (watchOS).
- Improved support for trackpad/mouse pointer (iPadOS 15).
- Fixed the following issue: dropped pin in the "Choose Location" sheet was sometimes not recognized by the parent "Add/Edit Location" sheet (iOS/iPadOS).
- Optimized the usage of the location service (iOS/iPadOS/watchOS). 5.0 12/13/2021 This update from Apple will improve the functionality of this app. No new features are included.
- Supported the always-on display of Apple Watch Series 5-7 (watchOS 8).
- Tweaks to adapt to Xcode 13. 4.0 09/25/2021 - Improved darkness of the "night vision" mode on iOS/iPadOS (caveat: due to technical reasons, some of the UI elements in the "Sheet" views remain bright). 3.6 07/26/2021 - Added "night vision" mode (iOS/iPadOS 14.5+ and watchOS). 3.5 07/19/2021 - Added a functionality to add events to calendar via the "Choose Date/Time" sheet (iOS/iPadOS). 3.4 02/28/2021 - Added a functionality to choose date/time based on LST (iOS/iPadOS).
- Added buttons in the "Choose Date/Time" sheet to reset to the current date/time and to step backward/forward by one sidereal day (iOS/iPadOS). 3.3 02/22/2021 - Added a display of LST(s) in the "Choose Date/Time" sheet (iOS/iPadOS). 3.2 02/15/2021 - Supported configurable Widgets on iOS/iPadOS 14. Widgets created with older versions of the App will no longer work; please remove them and create new ones (sorry for the inconvenience).
- Added support for the following watchOS complication families: "Extra Large", "Graphic Bezel", "Graphic Extra Large", and "Utilitarian Large". 3.1 10/24/2020 - Added support for Apple Watch (watchOS 7.0 or later).
- Added tap-to-edit of existing locations in the list (iOS/iPadOS only). 3.0 10/03/2020 - Added support for iOS/iPadOS 14. Widget to display the current LST at the first location in the list can be placed on the Home screen. 2.0 09/18/2020 - Added a workaround for Japanese (and potentially some other languages) text input on the "New Location" sheet.
- New icon. 1.5 07/12/2020
LSTclock: sidereal time clock version 9.3
Updated At: 2026-03-20
Changes: - Added a functionality to set an alarm for calendar events created from the "Choose Date/Time" sheet (iOS/iPadOS).
- Modified the layout of the Main screen (watchOS).
- Added an option to hide UTC/JD/MJD on the Main screen (watchOS).
- UI tweaks.
LSTclock: sidereal time clock version 9.2
Updated At: 2026-02-21
Changes: - Worked around the issue with "Share" from Maps app on iOS/iPadOS 26.
- Added a functionality to set date/time in desired time zone on the "Choose Date/Time" sheet (iOS/iPadOS). As a side effect, settings for UTC display (show/hide and font size) are reset to the default values upon the update of the app (sorry for the inconvenience).
- Assigned swipe-to-right gesture to edit existing locations (iOS/iPadOS).
- UI tweaks.
LSTclock: sidereal time clock version 9.1
Updated At: 2026-02-07
Changes: - Improved darkness of the Night Mode.
- Added an option to disable auto-locking (sleeping) while using the app (iOS/iPadOS).
- Added a map type toggle on the "Search Results" sheet (iOS/iPadOS).
- Added a functionality to edit existing locations by swiping to right (watchOS).
- Bug fixes and UI tweaks.
LSTclock: sidereal time clock version 8.4
Updated At: 2025-03-28
Changes: Mar 28, 2025
Version 8.4
- Modified widgets and complications in some sizes to reflect the "Show JD/MJD" (iOS/iPadOS) and "Display Item" (watchOS) preferences. As a side effect, these settings are reset to the default values upon the update of the app and you will have to set them again (sorry for the inconveniences).
- Bug fixes and UI tweaks.
LSTclock: sidereal time clock version 8.3
Updated At: 2024-12-08
Changes: Dec 8, 2024
Version 8.3
- Added an option to show Julian Date / Modified Julian Date on the main screen.
LSTclock: sidereal time clock version 7.0
Updated At: 2023-10-09
Changes: Oct 9, 2023
Version 7.0
- Dropped support for iOS/iPadOS 14 and watchOS 8. On watchOS, you may be forced to set up the app contents and complications again. Sorry for the inconveniences.
- Supported StandBy widgets (iOS 17).
- Supported Smart Stack widgets (watchOS 10).
- UI tweaks.
LSTclock: sidereal time clock version 6.1
Updated At: 2022-10-08
Changes: Oct 8, 2022
Version 6.1
- Added an option to display LST in degrees. To show the switch for this option in watchOS, tap and hold on the "Night Mode" button.
- Added an option for the preferred format of longitude: sexagesimal or decimal (iOS/iPadOS).
- Added "Full Screen Mode", in which only the LST at a location is displayed (iOS/iPadOS).
- Changed the format of LST in complications from decimal hours to hours:minutes (watchOS).
- UI tweaks.
Disclaimer
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