GENERAL GEOLOGY (EARTH VALUES) Flashcards
Astronomical Unit (Au)
150 Million Km
Circumference of Earth
40,075 km
Ave Distance of Moon to Earth
384,401 km
Zodiac
A band in the sky on which the sun, moon and starrs move along
Total number of constellation
88
Brightest star in Orion located SE
Rigel (Blue White)
Beta Orionis
Alpha Orionis
Betelgeuse (Red Supergiant)
Stars located at the sword of Orion
Trapezium or Orion Nebula
Brightest Star in Canis Majoris
Sirius
Current North Star
Polaris
Earth’s Equator:
Celestial Equator
Earth’s Latitude:
Declination
Earth’s Longtitude
Right Ascenision
Vernal equinox
The point in the sky where the sun crosses the celestial equator at the onset of spring (Mar 21)
1 Hour = how many dregees of earth’s Rotation?
15 degrees
Rotation
Spinning of a body on its axis
Revolution
the motion of body along a path around a point in space
Axial Precession
the gradual change of the orientation of Earth’s Axis or the wobble
Mean Solar Day
24 Hrs the time interval from one noon to the next
Noon
the time when the sun has reached its highest point in the sky
Sidereal Day
the time its takes for earth to complete a rotation relative to a reference star other the sun. Measured by conunting the time interval for a star to reappear on the same position in the sky
length of sidereal day
23Hrs 56 mins 4 secs
Mean Earth Speed
107000 Km/hr
Distance from Earth to su
150 M km or 1 astronomical unit
Perihelion
147 M km on Jan 3
Aphelion
152 M km on July4
Ecliptic
Apparent annual path of the sun against the backdrop of celestial sphere or simply the apparent orbit of the sun
The alternate North Star due to precession that changes every 26,000 years
Vega
The time it takes for the sun to complete ts revolution around the galaxy
230 Million Years at 250 km per second
Mean distance of Moon toEarth
384,401 km
Synodic Month
29.5 days
Apparet lunar revolution
Sidereal Month
27 1/3 days
True revolution and Rotation of Moon around Earth
FACT
Moon Rotation and Revolution is equal that is the same lunar hemisphere is always seen on Earth
Solar Eclipse
New Moon Phase, Moon Casts shadow on Earth
Lunar Eclipse
Full Moon Phase, Moon pases on the shadow of Earth
Minimum number of eclipse in a year
4
Maximum number of eclipse in a year
7
Max duration of Lunar Eclipse
4 hours
Max duration of Solar Eclipse
7minutes only
Dark part of a shadow
Umbra
Light Part of a shadow
Penumbra
Kepler’s Law of Planetary Motion
1) Elliptical Orbits
2) Law of Equal Area
3) Harmony of the worlds - Orbital period is proportional to their mean solar deistance
