The phrase "astronomical calendars" is correct and usable in written English.
It can be used when referring to calendars that are based on astronomical events, such as the positions of celestial bodies or phases of the moon.
Example: "Many ancient civilizations relied on astronomical calendars to determine the best times for planting and harvesting crops."
Alternatives: "lunar calendars" or "celestial calendars".
Programmed to remain accurate until the year 2100, perpetual calendars were all over the watch shows in Geneva in January, as were other calendar functions, including annual calendars, which adjust automatically for short and long months, and astronomical calendars, which come decorated with symbols to indicate the phases of the moon, sunrise and sunset.
Get your astronomical calendars ready.
An elaborate astronomical calendar consisting of one long scroll.
What has proved to be the earliest record of the Mayan astronomical calendar, dating to c. 800 ce, was discovered at the Classic-period site of Xultun.
Maria Reiche, a German mathematician who spent most of her life studying and protecting the lines, supported the theory that they are a giant astronomical calendar.
Whether it was a Druid temple, an astronomical calendar or a centre for healing, the mystery of Stonehenge has long been a source of speculation and debate.
The idea that Stonehenge was designed to be an astronomical calendar, an observatory, or a calculator gained popularity in the mid-nineteen-sixties, prompted by the work of Gerald Hawkins, an astronomer at Boston University who published a book called "Stonehenge Decoded".
Some suggest he has a tendency to get it right – but largely because he normally predicts a longer winter which just so happens to coincide with the astronomical calendar.
María Reiche, a German translator who spent years studying the site and lobbying for its preservation, also concluded that it was a huge astronomical calendar and that some of its animal sketches were modeled after groupings of stars in the night sky.
On the other hand, the astronomical calendar uses the Earth's axis in relation to its orbit around the sun, with the transition between seasons marked at solstices and equinoxes.
Like some of the famous Egyptian temples, these temples were built to play with light, and many mysteries of the Mayan astronomical calendar are made clear when one understands the design of the "time temples" here.
