Due to the weather, the Museum is closed on Tuesday, January 27. All Tuesday programs and some Wednesday programs have been cancelled. Please check here for a full list, and check back for regular updates.
The Museum will be open on Wednesday, January 28, during regular hours, from 10 am to 5:45 pm.
Regular updates will also be posted to our Facebook page and Twitter account (@AMNH).
19th century, China
For use at different latitudes, rotating the dial’s vertical wheel changes the angle of the upper plate marked with hours. The shadow-casting pin must always point toward the celestial pole. Characters written on the wheel may relate to phases of the moon, the calendar or the zodiac.
AMNH Hayden Planetarium Collection 2087