地球は回り日はまた巡る

~太陽と日時計の探訪~

SundialVirtual sundials

Virtual sundials
(one-day animation)

Animation of the daily change of the sundial based on the specified location and date will be displayed below. Please enter the latitude, longitude, date and time zone, which is the time difference from UTC, then click/tap the Run button.

Latitude: ° (N:+,S:-)
Longitude: ° (E:+,W:-)
Date: M D (M:1-12, D:1-31)
Time zone: h (UTC±)
?

A sundial is displayed below.

This sundial displays time scale that corresponds to latitude and longitude. However seasonal error, namely equation of time (EOT), remains. The error is maximum 16 minutes. Accurate time can be obtained by subtracting the EOT from the time indicated by the shadow. Please see here for more details.