<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 sun path near to the winter solstice (November, December, January) 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 sun path near the winter solstice in the Southern Hemisphere (May, June, July) 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> <P> In the Northern Hemisphere, the sun path near to the summer solstice (May, June, July), the Sun rises in the northeast, peaks out slightly south of overhead point (lower in the south at higher latitude), and then sets in the northwest, whereas in the Southern Hemisphere the sun path near the summer solstice (November, December, January), the Sun rises in the southeast, peaks out slightly north of overhead point (lower in the north at higher latitude), and then sets in the southwest . A simple latitude - dependent equator - side overhang can easily be designed to block 100% of the direct solar gain from entering vertical equator - facing windows on the hottest days of the year . Roll - down exterior shade screens, interior translucent - or - opaque window quilts, drapes, shutters, movable trellises, etc. can be used for hourly, daily or seasonal sun and heat transfer control (without any active electrical air conditioning). </P>

Path of the sun in the northern hemisphere
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