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Astronomy: Chapter 5 quiz
Terms in this set (34)
The Earth's axis is tilted
23 degrees from vertical
When does Earth's tilt change?
The Earth is always pointing at 23 degrees from vertical, no matter the position in its orbit
if the Northern Hemisphere is tilted more towards the sun, an what would the sun look like for observer from the NH at noon? What season is it?
Sun would be directly over head at noon, summer.
if the Northern Hemisphere is tilted more towards the sun, an what would the sun look like for observer from the SH at noon? What season is it?
Sun would appear to be lower in the sky at noon, winter.
During spring/fall, Earth is tilted
sideways with respect to the sun, so neither hemisphere is tilted more towards or away
The Earth's orbit is almost completely
how does distance from the sun impact the seasons?
A hemisphere being closer to the sun because of the tilt of the Earth is NOT a cause of the seasons
Two effects of Earth's tilt causing seasons
1) height of sun in sky
2) length of days
The more perpendicular < light rays hit Earth's surface,
the more intense the light is. (summer)
what season is it when receives more perpendicular light rays & light intensity is high?
The less perpendicular < light rays hit Earth's surface,
the less intense light is. (winter)
what season is it when receives less perpendicular light rays & light intensity is low?
During summer, days are
During winter, days are
For a given location on Earth, the number of daylight hours
varies throughout the year
Does number the number of daylight hours vary throughout the year?
From winter to summer, the days get
From winter to summer, days get
which latitudes experience extreme variations in the number of daylight hours throughout the year?
very HIgh (420) latitudes! closer to north or south poles
length of day throughout the year is dependent on
Where does the length of the day does not vary throughout the year? why?
Equator, the sun is always high in the sky, it is always 12 hours of day.
Everyone at every latitude has the same length day during the
spring and fall equinoxes
During the spring and fall equinoxes, who experiences the same length of day?
The higher the number of hours of daylight,
the higher the average temperatures for a location
what is correspondent to temperature of the seasons
average length of day
length of day are ______ during equinoxes
equinoxes and solstices occur
twice a year
when the sun is more directly over either hemisphere
the smaller the area being heated is,
the more intense the rays are. (vice versa)
When the sun doesn't reach very high above the horizon, and the the rays are ______.
slanted, spreading over a larger surface area, thus colder temp.
When the sun is high above horizon, and the rays are
more concentrated in one area, the rays are _____/_____/____________
vertical, direct, perpendicular. Light is more intense in this case, therefore temp is hotter. (vice versa)
Planetary seasons are caused by:
1. Tilt of the rotation axis
2. Changing distance from the Sun
change in distance from the sun
Do you have to have both an eccentric orbit and a tilted rotation axis in order to have seasons?
No, you can have one or the other for there to be seasons
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