What are the two ways that the tilt of Earth’s axis causes the summers in the United States to be warmer than the winters?

Discuss how latitude and longitude on Earth are similar to declination and right ascension in the sky.

The tilt of Earth on its axis causes seasons. Give two reasons why this tilt causes summer to be warmer than winter.

Why is it difficult to construct a practical calendar based on the Moon’s cycle of phases?

Make a list of each main phase of the Moon, describing roughly when the Moon rises and sets for each phase. During which phase can you see the Moon in the middle of the morning? In the middle of the afternoon?

Explain why there are two high tides and two low tides each day. Strictly speaking, should the period during which there are two high tides be 24 hours? If not, what should the interval be?

What is the phase of the Moon during a total solar eclipse? During a total lunar eclipse?

How does the tilt of Earth's axis and Earth's movements around the sun cause seasons?

What phase is the moon in when there is a total solar eclipse?

How does the tilt of Earth's axis affect how the sun's rays strike Earth?

Why don’t lunar eclipses happen during every full moon?

The rogue starship Galaxa is being chased by the battle cruiser Millenia. The Millenia is catching up to the Galaxa at a rate of 0.55c when the captain of the Millenia decides it is time to fire a missile. First the captain shines a laser range finder to determine the distance to the Galaxa and then he fires a missile that is moving at a speed of 0.45c with respect to the Millenia. What speed does the Galaxa measure for (a) the laser beam and (b) the missle as they both approach the starship?

Find the probability, expressed as a simplified fraction, that a randomly selected American, aged 25 or over, has not completed four years of high school.

Which major planet has the largest . . . A. semimajor axis? B. average orbital speed around the Sun? C. orbital period around the Sun? D. eccentricity?