<P> The following special cases are depicted . </P> <Ul> <Li> On the imaginary line of the equator the Sun maximum elevation is great during all the year but it doesn't form every day a perfect right angle with the ground at noon . In fact it happens two days of the year, during the equinoxes . The solstices are the dates that the Sun stays farthest away from the zenith but anyway also in those cases it's high in the sky, reaching an altitude of 66.56 ° either to the north or the south . All days of the year, solstices included, have the same length of 12 hours . </Li> <Li> The day arcs at 20 ° latitude . The Sun culminates at 46.56 ° altitude in winter and 93.44 ° altitude in summer . In this case an angle larger than 90 ° means that the culmination takes place at an altitude of 86.56 ° in the opposite cardinal direction . For example, in the southern hemisphere, the Sun remains in the north during winter, but can reach over the zenith to the south in midsummer . Summer days are longer than winter days, but approximately the difference is no more than only two and a half hours . The daily path of the Sun is steep at the horizon the whole year round, resulting in a twilight of only about one hour and 20 minutes in the morning and in the evening . </Li> <Li> The day arcs at 50 ° latitude . During the winter solstice Sun does not rise more than 16.56 ° above the horizon at midday, but 63.44 ° in summer solstice above the same horizon direction . The difference in the length of the day between summer and winter, from here to the north, begin to be striking--slightly more than 8 hours at winter solstice, to more than 16 hours during the summer solstice . Likewise is the difference in direction of sunrise and sunset . At this latitude at midnight (around 1 a.m. with summer legal hour) the summer sun is 16.56 ° below the horizon, which means that astronomical twilight continues the whole night . This phenomenon is known as the grey nights, nights when it does not get dark enough for astronomers to do their observations of the deep sky . Above 60 ° latitude the Sun would be even closer to the horizon, only 6.56 ° away from it . Then civil twilight continues almost all night, only a little bit of "nautical twilight" obviously around the local midnight . And above 66.56 ° latitude, there is no sunset at all, a phenomenon referred to as the midnight sun . </Li> <Li> The day arcs at 70 ° latitude . At local noon the winter Sun culminates at − 3.44 °, and the summer Sun at 43.44 °. Said another way, during the winter the Sun does not rise above the horizon, it is the polar night . There will be still a strong twilight though . At local midnight the summer Sun culminates at 3.44 °, said another way, it does not set, it is the polar day . </Li> <Li> The day arcs at the pole . At the time of the summer or winter solstices, the Sun is 23.44 ° degrees above or below the horizon respectively, irrespective of time of day . Whilst the Sun is up (during summer months) it will circle around the whole sky (clockwise from the North Pole and counter-clockwise from the South Pole), appearing to stay at the same angle from the horizon, therefore the concept of day or night is meaningless . The angle of elevation will gradually change on an annual cycle, with the Sun reaching its highest point at the summer solstice, and rising or setting at the equinox, with extended periods of twilight lasting several days after the autumn equinox and before the spring equinox . </Li> </Ul> <Li> On the imaginary line of the equator the Sun maximum elevation is great during all the year but it doesn't form every day a perfect right angle with the ground at noon . In fact it happens two days of the year, during the equinoxes . The solstices are the dates that the Sun stays farthest away from the zenith but anyway also in those cases it's high in the sky, reaching an altitude of 66.56 ° either to the north or the south . All days of the year, solstices included, have the same length of 12 hours . </Li> <Li> The day arcs at 20 ° latitude . The Sun culminates at 46.56 ° altitude in winter and 93.44 ° altitude in summer . In this case an angle larger than 90 ° means that the culmination takes place at an altitude of 86.56 ° in the opposite cardinal direction . For example, in the southern hemisphere, the Sun remains in the north during winter, but can reach over the zenith to the south in midsummer . Summer days are longer than winter days, but approximately the difference is no more than only two and a half hours . The daily path of the Sun is steep at the horizon the whole year round, resulting in a twilight of only about one hour and 20 minutes in the morning and in the evening . </Li>

When is the sun's path highest when viewed from the equator
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