# In-Class notes - 1 Numbers Science notations a...

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1. Numbers & Science notations: a. 230,000=2.3x10^5 b. 0.00054=5.4x10^-4 c. Light year: distance not time i. Speed of light: 3.0x10^5 km/s 2. Astronomical distance: a. 1 AU is avg. distance from earth to sun b. Our universe: i. We are in the localgroup ii. Local is in the milky way iii. Middle of milky way is black 3. Solar System: a. Asteroid belt between mars and jupiter b. Jupiter is in the kuiper belt 4. Motion on axis: a. Motion on axis: i. @ N. pole 50 km/h ii. @ S. pole iii. @ equator 1600 km/h b. Motioin around sun: 108,00 km/h c. Motion of suns orbit around galaxy: 230 million years d. Motion milky way to other galaxy: 300,000 km/h i. All motion is relative because there is no fixed point 5. Latitude and longitude a. Tropic of cancer: 23* 26’ N b. W. Prime meridian: negative c. E. Prime Meridian: positive d. 60’ arcminutes= 1 degree e. 60” arcseconds= 1’ 6. Celestrial sphere a. Aligned with earth i. N. pole below celestrial pole b. Measured in hous c. 1 day celestial sphere rotates 360* or 24hrs 7. Ecliptic line: line of suns trace around earth a. Tilted @ earths angle 8. Convert DMS=decimal degree a. Ex: 24* 18’ 15” i. 24+18/60+15/3600

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