The basic unit of astronomical time measurement is the day, one rotation of Earth on its axis. But there is more than one way to define day. We can define it based on the Sun. One solar day is the ...

Pop quiz! How long is the average year? If you said “365 days”, then congratulations! You’re wrong. If you said “365.25 days” ...

Get ready for your horoscope to change it’s scope. For centuries, human beings have searched the stars to help them navigate the earth and understand themselves. Ancient Babylonians were among the ...

Sidereal time literally means “time by the stars.” A sidereal day is a measurement of one rotation of Earth referenced to distant background stars — think of this as the amount of time it takes a ...

OBSERVATORY practice in the past has always been to use separate clocks for indicating solar and sidereal time. In the case of quartz crystal clocks, this practice could be continued by using two ...

Did you know there’s more than one type of astrology in the world, or that these different types of astrology use completely different time-keeping systems? Western astrology is the “mainstream” type ...