| A | B |
|---|
| 40 degrees North | Latitude of Northampton |
| 90 degrees North | North Pole |
| Dec. 21 | 15 hours night, 9 hour day |
| solstice | Sun stopping |
| 23 1/2 degrees North | Northern limit of sun's rays |
| Mar. 21, Sept. 21 | 12 hours day, 12 hours night |
| June 21 | Sun on Tropic of Cancer |
| ellipse | Shape of earth's orbit around sun |
| 50 degrees | Altitude of sun Mar. and Sept. 21 |
| June 21 | 24 hours of daylight at North Pole |
| Rotation | Earth spinning on its axis |
| Revolution | 365 1/4 days around sun |
| 23 1/2 degrees | Tilt of earth's axis |
| Spring Equinox | March 21 |
| Northeast | Direction of sunrise on June 21 |
| West | Direction of sunset on Mar. 21 |
| 66 1/2 degrees North | Arctic Circle |
| 23 1/2 degrees South | Tropic of Capricorn |
