The duration of the twilight period between dawn and sunrise varies greatly depending on the observer's latitude, from a few minutes in equatorial regions to many hours in polar regions. Dawn may easily be determined by observing a thread. When the color of a thread can be determined, changing from black to the thread's distinctive color, the 'crack of dawn' has occurred. This same measure of ambient light can be used to determine, conversely, the instant of dusk.
Services for Bill Morton
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Services for William Morton
Monday, September 22, 2025
10 am - 1 pm (burial after)
Rago Brothers Funeral Home
7751 W Irving Park Road
Chicago, IL 60634
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