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E6B
Q
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44
Nº 39480
00:00:20
QUESTION
EXPLANATION
STATISTICS
COMMENTS
12
NOTES
FLT. COMP
In a sunrise/sunset table given for the 28th of June at a certain latitude, sunrise is given as
0239
and sunset is given as
2127
. What is the latitude?
A
55°S
B
60°N
C
80°N
D
00° N/S
Refer to figures 621, 582 and 1036.
Facts...
- The Earth’s axis (which passes through the North and the South Pole) is tilted at an angle of 23.5°
- On the 21st of June, Earth is close to the farthest distance to the sun (Aphelion). During this period, tilt is towards the sun and the northern hemisphere experiences summer time
- Daytime is longer than nighttime ⇒ sun rises earlier and sets later. Daylight period is extended in the far North during the summer months and drastically reduced in the winter months
- Locations near the equator, a fairly consistent sunrise and sunset at relatively similar times throughout the entire year - approximately around
0600
/
1800
LMT every day, plus or minus a few minutes
Evaluating answer options...
In a sunrise/sunset table given for the 28th of June at a certain latitude, sunrise is given as
0239
and sunset is given as
2127
. What is the latitude?
00°N/S ⇒ WRONG: consistent sunrise and sunset at relatively similar times throughout the entire year - approximately around
0600
/
1800
LMT
80°N ⇒ WRONG: on latitudes further (bigger) than 66.5°N, sun does not set
55°S ⇒ WRONG: during summer solstice (June 21), daytime is shorter than nighttime in
southern
hemisphere
60°N ⇒ CORRECT: at high latitudes (but lower than 66.5°N) in the northern hemisphere ⇒ longer daytime / short nighttime
Additional information...
The Earth’s axis (which passes through the North and the South Pole) is tilted at an angle of 23.5° to line that is perpendicular to the orbital plane. Thus the angle between the Earth’s axis and the orbital plane is 90° − 23.5° = 66.5°. Because of this tilt, as the Earth rotates around the Sun, the rays will be perpendicular to the surface in the region between the parallels 23.5° S and 23.5° N. The Sun is over the Equator on the 21
st
of March - as the Earth rotates, the perpendicular rays are moving North so that on the 21
st
of June the Sun is overhead the 23.5° N parallel. Then moving South so that on the 23
rd
of September the Sun is again overhead the Equator and on the 21
st
of December will be overhead the 23.5° S parallel. The result is that the daylight period is extended in the far North during the summer months and drastically reduced in the winter months. If you are at a location near the equator, for example Ecuador, then you would have a fairly consistent sunrise and sunset at relatively similar times throughout the entire year - approximately around
0600
/
1800
LMT every day plus or minus a few minutes.
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