Chapter 1 Flashcards
The average distance from the Earth to the Sun, 149,600,000 km can be written in shorthand notation as-
1.496 x 10 ^8 km
There are 1000 mm in 1 m. This
means that a distance of 10mm is-
1 x 10 ^-2 m
10^2 x 10^5 =
10,000,000
100 (10 ^0) =
1
10^-3 x 10^3 =
1
(3 x 10^4)^4=
8.1 x 10^17
(.5)^3 =
0.125
(8.0 x 10^5) / (2 x 10^3) =
400
The ecliptic can be defined as the-
Path traced out by the Sun in our sky over one year against the background stars.
In which direction dies the Sun appear to move along the ecliptic over the course of a year, relative to the background stars?
East
If we could see background stars in the daytime, the Sun would-
Appear to move eastward against them at a rate of 1• per day
The earth would NOT have seasons if-
It’s axis of rotation were perpendicular to its orbital plane
Why do we see different phases of the moon?
The illuminated half if the moon becomes more or less visible from earth as the moon orbits the earth
The phase if the moon when the sun NAND moon have the same right ascension-
New moon
Approximately when dies a full moon rise?
Sunset
How often does the moon rotate to keep one face pointed toward the earth at all times?
Once per month
The total in Ed if eclipses is limited to seven or fewer per year because one condition that must be met for a lunar or solar eclipse is that the-
Moon be close to or crossing the ecliptic plane.
What is the approximate inclination if the moon’s orbit to the ecliptic plane?
5*
A solar eclipse occurs in the earth when the
Moon casts a shadow in the earth
A lunar eclipse does not occur at every full moon because the
Plane if the moon’s orbit I’d at an angle to the place of the earth’s orbit.
A lunar eclipse is caused by the
Moon passing unto the shadow of the earth
The difference between an umbral eclipse and a penumbras eclipse is
The distance of the moon above or below the ecliptic
A total solar eclipse is visible (assuming clear skies everywhere) to
Only people in aping narrow path, much smaller than a hemisphere
What is the major factor they governs whether a douse eclipse is a total rather than annular when viewed from the center of the eclipse path on earth?
Earth-moon distance
