The astronomical calendar clock dates from 1530 and occupies what was once the city's western gate.

The Achuar follow an astronomical calendar of seasonal resources, like the fish season, which is divided into days, moons, and year.

The little box blinked its indication of a message, an event so rare as to deserve an entry on the astronomical calendar.

Some sites are astronomical calendars, others lunar observatories, showing the scientific abilities of prehistoric man.

The figure was an early astronomical calendar for knowing where the moon would set; by knowing this the day, crop cycle, and season could be determined.

As with many other almanacs, an extensive astronomical calendar is included.

Many mysteries of the Maya astronomical calendar are made clear when one understands the design of the 'time temples' here.

The 16 postholes associated with the mound and enclosure have recently been interpreted as a simple astronomical calendar, to determine seasonal events or holidays.

It should be noted here that the Indian astronomical calendar is not based on the Western sidereal system but has a differential lag.

From 1924 to 1926, he was the editor of Bošković, an astronomical calendar.