All scientific ideas, even those with strong support, are provisional, skepticism important role
Observe, Predict, Test, Observe, Revise, Repeat, successful then Scientific Theory
cosmological principle states that there is nothing special about our place in the universe
Matter and energy obey the same physical laws everywhere – assumption
Angular Measure for Small Angles – 1º = 60 arcminutes = 60′, 1′ = 60 arcseconds = 60”, 1º = 60×60 = 3,600 arcseconds = 3,600”
Light year is a distance of light in one year, (6 trillion miles), We use this measure for distances beyond the solar system i.e. between the stars
and galaxies
AU is distance between earth and sun, 150,000,000 km = 1.5 x 108 km, 93,000,000 miles = 9.3 x 107 miles, we use this measure for distances in
and around the solar system
The Earth@ 29 1/2 Yard Line, Homo Sapiens@ 0.16-inch Line, time of periods to now is the size of sheet of paper
Stars rise approximately 4 minutes earlier each day, 2 hours earlier each month, due to earth’s orbit and axis of the sun
8hrs/2hrs per month= 4months LATER, counterclockwise is proper motion, clockwise is retrograde motion or westward movement
88 Constellations, The zenith; is the point straight up. It is generally in the center of your star map, Nadir is the point opposite the zenith,
Horizon the point where the sky meet the Earth, Celestial pole is the projection of the Earth’s pole, Celestial equator is the projection of the
Earth’s equator, Meridian is the line that runs north and south through the zenith
Plane of earths orbit is called an ecliptic, constellations along the ecliptic are the constellation of the zodiac
Longitude up and down, latitude side to side, The Celestial Sphere has been divided into declination (N-S) and right ascension (E–W)
Seasons are a result of the earth’s tilt, four special days, two equinoxes and solstices
1582 AD, Pope Gregory XIII introduced the Gregorian calendar, Years divisible by 4 will be leap years
Easter is determined on a lunisolar calendar, first Sunday after the full moon following the Vernal equinox, Passover begins 15th day of the
month of Nisan essentially the full moon following the Vernal equinox, Ramadan is the ninth month of the Ialamic lunar calendar Saturday,
