#### Earth-Sun Relationships

As part of Earth's energy budget, which location would have the greatest annual variation in daily insolation?

South Pole

If a ship has a clock set to UTC that reads 5:00 a.m., and the navigator sees the Sun directly on the meridian at the ship's current location, what is the longitude of their position?

105�E

Where should the eastern boundary of the time zone for the central meridian at 45�E be located?

52� 30'E

Which location here will have the Sun directly overhead at solar noon only one day a year?

Emerald, Australia (23� 30'N, 148� 8'E)

Without political considerations, if it is 7:00 p.m. Thursday at 45�N, 165�E, what is the time and day at 30�S, 150�W?

10:00 p.m. Wednesday

Which location would have the longest period of daylight on November 25?

Deseado, Argentina (47� 17'S, 68� 21'W)

Within a time zone, what generally determines the setting of the clocks?

The position of the Sun at the nearest central meridian

Using the analemma, what is the sun angle at Santiago, Chile (33�S, 70�W), on April 1?

53�

What is the Sun angle at Dover, Delaware, USA (39�N, 76�W), on December 21?

27.5�

Using the analemma, where is the subsolar point on December 2?

22�S

What is the sun angle at Berlin, Germany (53�N, 13�E), on June 21?

60.5�

Which pair of factors contributes the least to seasonal changes?

Rotation and differing distance between Earth and Sun

Without political considerations, if it is 4 p.m. Friday at 30�N, 90�W, what is the time and day at 45�S, 60�W?

6 p.m. Friday

How far across the sky will the Sun move in an hour and twenty minutes?

20�

What is the sun angle at Paris, France (49�N, 2�E), on September 22?

41�

Using the time zone map of political adjustments to the time zones, if it is 9 p.m. Saturday in Madrid, Spain (40�N, 4�W), what is the actual time and day in Aksu, China (41�N, 80�E)?

4 a.m. Sunday

If a ship's chronometer reads 9 p.m. when the navigator views the Sun directly on the meridian at the current location, what is the longitude of the ship?

135�W

Where on Earth does the length of daylight measure 12 hours and the length of darkness measure 12 hours every day of the year?

The equator

How is sun time different from clock time?

Sun time is based on the actual position of the Sun at the specified location.

Which set lists types of radiant energy from shortest to longest wavelengths?

X-rays, visible light, and microwaves

Without political considerations, if it is 3 a.m. Tuesday at 30�S, 15�E, what is the time and day at 30�N, 90�W?

8 p.m. Monday

Why do locations on Earth experience twilight and dawn?

The thick atmosphere of Earth scatters the light.

Using the analemma, what is the sun angle at Inuvik, Canada (68�N, 134�W), on January 13?

0�

What is the speed of light?

299,792 km/s or 186,282 mi/s

Using the analemma, where is the subsolar point on August 2?

18�N