Unformatted text preview: • but the best way to think of it is like a flat ruler placed on the sky. • One degree = 60' (minutes). The sun's or moon's diameter is about 30', or 1/2°. • One minute = 60" (seconds). One second is the smallest separation visible in most telescopes. Angular Measure is also used to measure arc lengths on the spherical earth. • 1° is the north-south length of the corner missing from the otherwise rectangular shape of Utah. • 1' of latitude is one nautical mile (a little more than a usual mile). • 1" of latitude is almost exactly 100 feet. • Note that angles of longitude are less than latitude because longitudinal lines get closer together as one approaches the poles. For example, Utah is 5° high and 5° wide, but it doesn't look square....
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- Fall '10
- Astronomy, Orders of magnitude, Big Dipper, angular measure, SMALLEST SEPARATION, arc lengths