This is a detail of how quickly the shadow of the gnomon moves.
The lens cap was not moved. The rightmost piece of tape in the upper images is the one detailed in the lower images. Note how far off the gnomon’s “point” moves in 1 minute, between 9:00 and 9:01.
August 10, 2006 at my desk at work in Oakland, CA.
MOST COMMENTED
Observatory
Observatory 2.0 – Time has come today!
General / Maintenance
First Light, a deeper look
Mount / Observatory / Telescope
Observatory 2.0 – Result!
Observatory
Observatory 2.0 – The Pier goes in
Gear / General / Maintenance
Martin Farmer Wormblock installation notes
Deep Sky / Long Exposure Photography
NGC2244, The Rosette Nebula
Deep Sky / Long Exposure Photography
Another beautiful night.