HowStuffWorks "Time in Astronomy - Encyclopedia Entries"

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Learn about Time in Astronomy and get information on topics related to Time in Astronomy.

Learn about Astronomical Measuring Devices and get information on topics related to Astronomical Measuring Devices. See more »

Gregorian, gruh GAWR ee uhn, calendar is the calendar that is used in almost all the world today.

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Christian Era is the period from the birth of Jesus Christ to the present.

Chronometer, kruh NOM uh tuhr, is an instrument that keeps time with extreme accuracy.