THE EDGE OF NIGHT
(Fall Session)
Friday 7 November from 4:45pm to 6:45pm CST
For ages six and older. No admission fee.
It’s not light, it’s not dark. It’s that special time called twilight, and HRPO wants to introduce you to it!
*Are all sections of the sky the same shade of blue?
*Which stars are seen first?
*Are Mercury and Venus or the Moon out?
*Is that moving object a plane, a satellite or space debris?
*How much actual darkness should I expect in a light-polluted city when twilight has passed?
There is no other time like twilight. Bring it into your life!
5:11pm = “civil twilight” begins (search for crepuscular rays)
5:38pm = “civil twilight” ends; “nautical twilight” begins
5:45pm = Saturn appears [mag 0.9]
5:48pm = the star Fomalhaut appears [mag 1.1]
5:50pm = The Summer Triangle appears
—consisting of Vega [0.0], Altair [0.8] and Deneb [1.3]
5:57pm = The North Star appears [mag 2.0]
6:06pm = “nautical twilight” ends; “astronomical twilight” begins
6:09pm = the constellation Cassiopeia appears
6:34pm = “astronomical twilight” ends
7:20pm to 7:25pm = magnitude 2.3 pass of Cosmos 2278 Rocket
(The various twilights will be explained.)
This program pre-empts the Friday Night Lecture Series on…
*the last Friday in spring before Daylight Time begins
*the Friday during the week of Independence Day
*the first Friday in fall after Daylight Time ends