Atlantis Online
March 29, 2024, 04:24:42 am
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Ice Age blast 'ravaged America'
http://news.bbc.co.uk/2/hi/science/nature/6676461.stm
 
  Home Help Arcade Gallery Links Staff List Calendar Login Register  

The Gnomon - Sundial

Pages: 1 2 [3] 4   Go Down
  Print  
Author Topic: The Gnomon - Sundial  (Read 15887 times)
0 Members and 43 Guests are viewing this topic.
Bianca
Superhero Member
******
Posts: 41646



« Reply #30 on: December 16, 2007, 08:30:34 am »








V





vernal {spring} equinox: see equinoxes.

verdigris: (pron. ver-de-gree) the green patination found on weathered brass and copper.

vernier: a small moveable scale for obtaining fractional parts of the subdivisions of a fixed scale. Invented by Pierre Vernier in 1631 (published Brussels, 1638). For circular scales, a Type A vernier has a central zero. After about 1780, sextants commonly had a Type B vernier with the zero on the right of the scale. European instruments often have the very similar nonius.

vertical angle: the angle from the zenith to the horarius circle passing through the sun, measured along the prime vertical (the E-W vertical circle). It is one of the ptolematic co-ordinates.

vertical plane: see principal plane.

volvelle: (pron. vol-vel) an old device consisting of one or more movable circles surrounded by other graduated or figured circles. It is used for showing the rising and setting times of the Sun and Moon, the state of the (marine) tides etc. A ~ has sometimes been included around the rod-gnomon of equiangular dials.
Report Spam   Logged

Your mind understands what you have been taught; your heart what is true.
Pages: 1 2 [3] 4   Go Up
  Print  
 
Jump to:  

Powered by EzPortal
Bookmark this site! | Upgrade This Forum
SMF For Free - Create your own Forum
Powered by SMF | SMF © 2016, Simple Machines
Privacy Policy