<Table> <Tr> <Td> </Td> <Td> This section is too long . Consider splitting it into new pages, adding subheadings, or condensing it . (June 2017) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section is too long . Consider splitting it into new pages, adding subheadings, or condensing it . (June 2017) </Td> </Tr> <P> Sun paths at any latitude and any time of the year can be determined from basic geometry . The Earth's axis of rotation tilts about 23.5 degrees, relative to the plane of Earth's orbit around the Sun . As the Earth orbits the Sun, this creates the 47 ° declination difference between the solstice sun paths, as well as the hemisphere - specific difference between summer and winter . </P> <P> In the Northern Hemisphere, the winter sun (December, January, February) rises in the southeast, transits the celestial meridian at a low angle in the south (more than 43 ° above the southern horizon in the tropics), and then sets in the southwest . It is on the south (equator) side of the house all day long . A vertical window facing south (equator side) is effective for capturing solar thermal energy . For comparison, the winter sun in the Southern Hemisphere (June, July, August) rises in the northeast, peaks out at a low angle in the north (more than halfway up from the horizon in the tropics), and then sets in the northwest . There, the north - facing window would let in plenty of solar thermal energy to the house . </P>

What causes the motion of the sun throughout the day
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