11 degree equals
60 minutes
260 minutes equals
3600 seconds
3civilization was
10k years ago
5distance to the moon from earth is
3,474 km
6suns diameter
1,391,980 km
7earth is one...
astronomical unit away from the sun
8light travels at
186,000 per second
9Nearest star to us
proxima centauri (4.3 lyrs away)
10Galaxy shape can be
ordinal or barred
11barred galaxy
it is similar to a spiral galaxy but the spiral extends from a bar of stars that stretches from the center
12two major components of our local group
andromeda and milky way
13Hipparchus
first person to classify brightness
14brightest stars are
1st magnitude
15faintest stars are
6th magnitude
165 magnitudes
= 100 times in brightness, so for 1 magnitude unit 20x in brightness
17best telescope can see
30th magnitude
18brightest star
sirius (-1.45)
20what is a parsec
3.26 light years
21Big dipper, polaris, and cassiopea relationship
the star merak and more importantly on the big dipper, Dubhe, point directly toward polaris which is on the end of ursa minor. directly across from polaris is cassiopea.
22during spring which constellations are setting in the west
winter constellations
231st point of aries
marks the location of the sun - in front of the backdrop stars of the zodiac - on the March equinox. Astronomers consider the First Point of Aries to be the zero point in the imaginary grid on the sky's dome that helps them define star (and planet) locations
24Regulus
in Leo, one of the brightest stars in the sky w magnitude of 1.35
25for NH observers, stars rise in the east and set in the
west
26When objects are crossing they meridian they
culminate (best time to view them)
27HA
how long has it been since it crossed the meridian
29Suns path
21st March, then 21st June, then 21st of September, then 21st of December
30Our latitude is 28.1 degrees
so 90-28.1 = 61.9 which is the line of visibility. Anything under 61.9 will not set.
31Circumpolar
declination of 90-latitude
32for tampa, any star that has a declination greater than
61.9 is circumpolar
33In the NH stars cross
twice
34in the SH stars cross
once
35the 6 circumpolar constellations for Tampa are
Ursa minor, ursa major, perseus, cassiopea, cepheus, and Camelopardalis
36Celestial equator has a declination of
0°
37Polar star has declination of
90
38the height of the polar star is = to
latitude
39on the equinox the sun rises
exactly due East and sets exactly due West so it is at 0 degree declination
40Summer highest point of sun is
angle of (90-lat) + 23.5 degrees
41Winter lowest point of sun is
angle of (90-lat) - 23.5 degrees
42Sun appears higher in the
summer
43For an observer at a giving latitude any stars at a declination of dec greater than (90-lat) will be circumpolar
they never set