Weather and Climate: Ch. 2 Flashcards
annual orbit around sun
Revolution
How many days is Earth’s revolution?
365.25 days
orbit slightly ________
elliptical
What is it called when Earth is closest to the sun?
Perihelion
How far is the Earth from the sun in a Perihelion?
91 million miles
When is Perihelion?
On or about January 3rd
What is it called when Earth is farthest from sun?
Aphelion
How far is the Earth from the sun in a Aphelion?
94 million miles
When is Aphelion?
On or about July 4th
What is the average distance from the Earth to the sun?
93 million miles
spinning of Earth on its axis
Rotation
Rotation accounts for ____ and _____
day and night
______ regulated by amount of solar energy received at earth’s surface
Seasons
angle that sun strikes surface
Sun altitude
What causes the seasons?
- Sun altitude
- # of daylight hours at a latitude
Sun is directly _______
overhead
Solar attitude is max at ___
90° (vertical)
Solar rays (isolation) are most _________
concentrated
Tilt of Earth’s spin axis is ___
23.5°
Earth’s spin axis always remains in same orientation relative to stars during its revolution
Parallelism
90° solar altitude shifts from:
Tropic of Cancer (23.5° N) to Equator to Tropic of Capricorn (23.5° S)
When does the Summer Solstice occur?
Occurs June 21 or 22
Where is the sun during the Summer Solstice?
Sun directly (90°) above Tropic of Cancer (23.5° N)
During the Summer Solstice, Northern Hemisphere days greater than ___ hours
12
Summer solstice is the _______ day length of year
longest
When does the Autumnal (fall) Equinox occur?
Occurs September 22 or 23
Characteristics of the Autumnal Equinox
- Sun directly (90°) above Equator (0°)
- All locations have a 12 hour day (equal)
When does the Winter Solstice occur?
Occurs December 21 or 22
Characteristics of the Winter Solstice
- Sun directly (90°) above Tropic of Capricorn (23.5°S)
- Northern Hemisphere days less than 12 hours
- Shortest day length of year
When does the Vernal (spring) Equinox occur?
Occurs on March 20
Characteristics of the Vernal Equinox
- Sun directly (90°) above Equator (0°)
- All locations have a 12 hour day
Season in the Southern Hemisphere is ________ of the Northern Hempisphere
opposite
Southern Hemisphere is ______ to sun in summer but not significant difference from NH
closer
Great amount of water absorbing heat in the _______ hemisphere
southern
Capacity to do work on some form of matter
Energy (NRG)
What are the 2 forms of energy?
- Kinetic Energy
- Potential Energy
Characteristics of Kinetic Energy
- Energy of motion
- Faster something moves = greater kinetic energy
Potential to do work
Potential Energy
Measure of average kinetic energy of molecules in a substance
Temperature
Energy transferred from one object to another (temperature difference between two objects)
Heat
Heat is transferred from a ______ object to a _______ object
hotter; colder
Heat we can feel and measure with a thermometer
Sensible heat