S&T Clock (pronounced "set" as in Signa et Tempora) measures time using 24 unequal hours each solar day. The hours are unequal in the sense that in summer, the 12 hours above the horizon represent more time than the 12 hours below, while the opposite is true for winter. Daytime hours of the same day, as well as nighttime hours of the same night, are equal; but daytime hours and nighttime hours of the same day are only of equal length on the Equinoxes.
The horizon of the clockface represents the Horizon of the selected location, and the rings surrounding the clock represent the Ecliptic. Each day the Sun indicator crosses the Eastern Horizon (sunrise), rises to the top of the clockface (culmination), passes under the Western Horizon (sunset), and traverses underneath the horizon line to return to the East (night).
The movement of the Moon in relation to the Ecliptic and Horizon is also shown, as well as the Lunar Phases. The visible Planets can also be displayed in relation to the Ecliptic, showing both their prograde and retrograde motions.
The Zodiac also follows its daily course, and the position of the Sun, Moon, and Planets in relation to the Zodiac is also shown. Different Zodiac configuration options are available. Over the course of the year, the Sun is shown progressing through the Seasons, both natural and liturgical.
Clock Face
Seasons
Zodiac
Liturgical
Clears cache and reloads from server
Removes locally saved data from your device
Last Updated: 2026-04-11
Signa et Tempora Clock (S&T Clock) by Caleb G. Hall
github.com/calebghall/Signa-et-Tempora-Clocka. Technical Log Data (GitHub)
S&T Clock is hosted as a static GitHub Pages site. When you visit this site, GitHub may collect User Personal Information, including logs of visitor IP addresses, to comply with legal obligations, and to maintain the security and integrity of their Service and this Website.
What is collected: Data about your interactions with GitHub Services and S&T Clock, such as IP address, device information, session details, date and time of requests, device type and ID, operating system and application version, and data about your Website interactions including referring site, pages viewed, and links clicked.
Purpose: GitHub Business Operations, Inference, Safety and Security, Service Provision, Troubleshooting, Ongoing Service Performance, Complying with and resolving legal obligations, Delivering Professional Services, Improving Professional Services
Relationship: GitHub acts as a Data Processor on behalf of S&T Clock. For more information, including GDPR and US State specific information, please see the GitHub Privacy Statement.
b. Location Information
This website allows you to set your location to calculate astronomical data (such as sunrise, sunset, and moon phases). You can provide this in three ways:
This site uses localStorage, a standard web technology that allows us to store data locally on your own device.
What is stored: If you choose to save your settings, your location coordinates and/or city name are stored so that S&T Clock remembers your preferences the next time you access this site.
Your Control: This data stays on your device indefinitely until you manually clear your browser's cache/site data or use the "Clear Settings" feature within the app. This data cannot be accessed, seen, or deleted from any other system because it never leaves your device.
This website does not use cookies or third-party analytics.
Because your location and settings data is not stored remotely, there is no "retention" period. Technical logs managed by GitHub are subject to GitHub's own retention policies for security logs.
Depending on the jurisdiction, you may have the right to access, rectify, or erase your personal data, the right to restrict or object to processing, the right to withdraw consent, and the right to file a complaint with the relevant authorities. Since S&T Clock does not store any of your data remotely, you are in full control of deleting the localStorage data in the settings menu. For requests regarding technical logs, you may contact GitHub for additional information.