a1_03_phases_eclipses

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Unformatted text preview: The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the fle again. IF the red x still appears, you may have to delete the image and then insert it again. Angular Measurements: A Quick Review To scale objects in the sky we measure degrees, minutes and seconds 1 degree = 60 arc minutes or 60’ 1 arcminute = 60 arc seconds or 60” therefore, 1 degree = 3600” The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the fle again. IF the red x still appears, you may have to delete the image and then insert it again. The Moon subtends an angle of ½ degree or the Moon has an angular size of ½ degree. The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the fle again. IF the red x still appears, you may have to delete the image and then insert it again. Night sky Rule of Thumb : one finger width = 2 deg. one hand width = 10 deg. The Small-Angle Formula D = ( α x d ) / 206,265 D = linear size of object α = angular size of object (in arcsec) d = distance to the object Converting angular measurement to something meaningful: The Earth, Sun & Moon Phases of the Moon, & Eclipses Some basic numbers Semi-major axis: 384,400 km (239,000 miles) Orbital Eccentricity: 0.055 Orbital Inclination: 5.2 degrees Orbital Period: 27.321 days (Sidereal = real) 29.531 days (Synodic = apparent) Diameter 3476 km (~ 2160 miles) Density: 3.36 g/cc (3.35 uncompressed) Mass (Earth = 1): 0.0123 (= about 1/81 ) Mass (Earth = 1): 0....
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This note was uploaded on 05/05/2010 for the course ASTR 001 taught by Professor Robertfesen during the Spring '10 term at Dartmouth.

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a1_03_phases_eclipses - The image cannot be displayed Your...

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