Do the perihelion and aphelion times for the Earth correspond to the solstice dates?
• If the day is 23 hours and 56 minutes long and we use 24-hour clocks, where do the extra 4 minutes go? • Why does the first day of summer arrive on December 1 and not December 21 in the southern hemisphere? • Are there any alternative theories about what causes the seasons on the Earth? • Why is the tilt of the Earth’s axis 23 1/2 degrees? • Was the tilt of the Earth’s axis ever larger than 23 1/2 degrees in the past? • Has El Nino really slowed down the rotation of the Earth? • Does the rotation of the Earth affect the way water goes down a drain in the North and South Hemispheres? • How old is the Earth? • Is the Earth’s pole shifting? • How many different directions does the Earth move in space? • How do we know the speed of the Earth? • Why is the sky blue? • How is the mass of the Earth determined? • Are there differences in gravity from one place on the Earth to another? • Why is the Earth tectonically active and not Mars or Venus? • Over a 10 kilometer run, how high is the Ear
