By Nick Strobel

Astronomy Notes

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Stars rise in the East half of the sky, reach maximum altitude when crossing the meridian (due South) and set in the West half of the sky. The Celestial Equator goes through due East and due West. For another more detailed example, let’s choose Los Angeles at latitude 34◦ N. The number of degrees the NCP is above the horizon equals your latitude, so, therefore, the NCP is now 34 degrees above the north horizon. The diagram for latitude 34◦ N is shown above. ). Because the Earth’s equator is 90◦ away from the north pole, the number of degrees the celestial equator is above the opposite horizon on the meridian will always be 90◦ – your latitude.

What causes the amount of energy reaching a given location during the day to change throughout the year? 1 million kilometers at aphelion); and 2) the tilt of the Earth’s axis with respect to its orbital plane. If the first theory were true, then both the north and south hemispheres should experience the same seasons at the same time. They don’t. Using the scientific method discussed in chapters 1 and 2, you can reject the distance theory. A popular variation of the distance theory says that the part of the Earth tilted toward the Sun should be hotter than the part tilted away from the Sun because of the differences in distances.

2. Why is there a difference between the sidereal day and solar day? 3. If the Earth rotated twice as quickly as it does now, what would be the difference in minutes between the solar and sidereal days? Explain how you got your answer. 4. If the Earth’s year was twice as long as it is now, what would be the difference in minutes between the solar and sidereal days? Explain! 5. 98 solar earth days. Show how to find out how long a solar day is on Mars. 3 Time Zones People east of you will see the Sun on their meridian before you see it on yours.

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