| |
| | Orbital Effect on Weather Notes, 2004 / 2005 (Site not responding. Last check: 2007-10-24) |
 | | That’s wrong, because the tilt of the northern hemisphere away from the Sun in January reduces the heat we receive (at mid-latitudes) by 50%; and in July, the tilt of the northern hemisphere towards the Sun increases the heat we receive by 50%. |
 | | Land (1/2 land, 1/2 ocean in N) heats up a lot more in sunlight than ocean (90% ocean, 10% land in S), because (1) water needs a lot of heat to warm up, and (2) sunlight is absorbed only at the surface on land, but by tens of feet in the ocean. |
 | | So that the Earth as a whole is warmest when at aphelion, furthest from the Sun, because that’s when the ‘land’ hemisphere in the N has its summer; and is coldest when at perihelion, closest to the Sun, because that’s when the ‘land’ hemisphere in the N has its winter. |
| cseligman.com /orbitnotes.htm (2602 words) |
|