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Credit & Copyright: Astronomie-AG,
Progymnasium Rosenfeld,
Till Credner, AlltheSky.com
Explanation:
Have you ever wanted to be a gnomon?
Of course, a gnomon is the tall part of a
sundial
that casts a shadow.
The gnomon's shadow moves as the Sun moves across the sky,
indicating time by the shadow's position on the dial face.
So on
July 19th, the Astronomy Group of the Progymnasium Rosenfeld
created a human sundial, each participant patiently playing the
role of the gnomon for 10 minutes.
In this timelapse video of their temporal
voyage of
discovery, one image was
taken every 20 seconds from 8 am until 4 pm Central European Summer Time.
Drawn on the ground are the dial hour marks calculated
to show the local time for that specific date.
Behind, the tower clock offers a time check.
Can you find the local time of solar noon?
(Hint: At solar noon the Sun is on the
meridan.)
The persistent group plans a repetition of the
human sundial performance next winter to compare the length
of the day and the altitude of the Sun.
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day