Kliek om te vergroot
Die Suidelike "Jet stream" soos op 4 Junie 2011 besig om oor Suidelike Afrika te beweeg. Tog as jy na die Wolkekaart van Kobus Botha (hieronder) kyk is dit oopgetrek oor Suid-Afrika.
Kliek om te vergroot
Hoe gaan die "seeing" vanaand by Boyden wees? Waarskynlik onstabiel. Is dit nie `n nfaktor wat ons amateurs nie in gedagte hou as ons observasieaande beplan nie. Agterna kla ons oor die voorwerpe wat rondspring.
Lees gerus die artikel hieronder wat ek op `n webtuiste raak ge-google het. Onderaan is 'n paar skakels.
Source: Astronomy Club of Asheville
"Seeing"
refers to the the amount of "blurring" caused by the earth's atmosphere
-- most apparent in a telescope using higher magnifications.
Astronomers refer to this atmospheric turmoil as "bad seeing". Seeing
well at high magnifications is only possible when the air is steady.
Excellent
seeing means, at high magnification, you will see fine detail on
planets. In bad seeing, planets might look like they are under a layer
of rippling water and show little detail at any magnification, but the
view of galaxies is probably undiminished.
Bad
seeing is caused by turbulence combined with temperature differences in
the atmosphere. The turbulence may be caused by ground level winds as
well as higher level air movements created by the jet stream. When the jet stream is overhead, seeing is generally poor.
Skakels
