Astronomy Fun Fact:Analemma: A graduated scale in the shape of a figure eight, indicating the sun's declination and the equation of time for every day of the year and usually found on sundials and globes.
| ETYMOLOGY: |
Latin, sundial, from Greek anal mma, from analambanein, to take up. |
Get on the APOD PING list! 
|
To: MozartLover; Joan912; NovemberCharlie; snowfox; Dawgsquat; viligantcitizen; theDentist; grlfrnd; ...
APOD PING!
To: petuniasevan; CaTexan
Extraordinary picture. Thanks!
To: petuniasevan
This is good work.
Thanks
5 posted on
07/09/2002 3:09:40 AM PDT by
antonz
To: petuniasevan
Amazing, good work!
To: petuniasevan
The analemma photo takes a year, during which time the camera has to be left bolted to the same spot and not moved at all. The brightnesses of the suns depend on atmospheric conditions at the times the shutter is opened. The film is not advanced between each exposure, so some cameras are not suitable for this application. The background image of the hills and clouds would be possibly be taken at a separate time. The shutter can be controlled electronically so it opens at exactly the same time each day, or a very dedicated astronomer could operate the camera manually.
To: petuniasevan
Very cool. Thank you for the ping, as always.
10 posted on
07/09/2002 4:52:57 PM PDT by
altair
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson