Credit: NASA/JPL-Caltech/Space Science Institute
Lunar observational calendar systems
Based on moon cycles, lunar calendars have been used by ancient civilizations to track changes in seasons, agricultural activities, daylight lengths and temperatures, as well as important religious and cultural events.
Islamic Hijri Calendar; a single cycle system
Brief history
Created in 622 AD, the Islamic Hijri calendar is a pure lunar calendar system, with no leap year events or synchronization of a secondary cycle. It is one of the most prominent and widely used calendars worldwide. Linked to an astronomical signal in both time and space, each lunation cycle, or synodic month, can be associated with religious observance. The calendar system does not align to a dual cycle Gregorian calendar system, creating the requirement to follow two calendars.
What can Vartis360 do different?
Introduction of Vartis360 - Lunation offers a time keeping device designed to allow Muslims the ability track the months and important religious calendar days on the Islamic Hijri calendar, quickly and easily. It also provides the interactive visual ability to observe the moon as it passes through each lunar cycle, offering an experience to connect the positions of the moon, Earth, and Sun with calendar dates simultaneously.
References
Moore SD. Dynamical astronomical object-relative cyclic signal inputs for discrete time modeling with calendric applications. Research Square. submitted (Version 1).