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The points are spaced 15° apart along the ecliptic [2] and are used by lunisolar calendars to stay synchronized with the seasons, which is crucial for agrarian societies. The solar terms are also used to calculate intercalary months ; [ 3 ] which month is repeated depends on the position of the sun at the time.
Most sun charts plot azimuth versus altitude throughout the days of the winter solstice and summer solstice, as well as a number of intervening days.Since the apparent movement of the Sun as viewed from Earth is nearly symmetrical about the solstice, plotting dates for one half of the year gives a good approximation for the rest of the year.
The solar seasons change at the cross-quarter days, which are about 3–4 weeks earlier than the meteorological seasons and 6–7 weeks earlier than seasons starting at equinoxes and solstices. Thus, the day of greatest insolation is designated "midsummer" as noted in William Shakespeare 's play A Midsummer Night's Dream , which is set on the ...
Given the different Sun incidence in different positions in the orbit, it is necessary to define a standard point of the orbit of the planet, to define the planet position in the orbit at each moment of the year w.r.t such point; this point is called with several names: vernal equinox, spring equinox, March equinox, all equivalent, and named considering northern hemisphere seasons.
Other growing season parameters could potentially be extracted, and global maps of any of these growing season parameters could then be constructed and used in all sorts of climatic change studies. A noteworthy example of the use of remote sensing based phenology is the work of Ranga Myneni [ 46 ] from Boston University .
[4] [5] At solar noon, the zenith angle is at a minimum and is equal to latitude minus solar declination angle. This is the basis by which ancient mariners navigated the oceans. [ 6 ] Solar zenith angle is normally used in combination with the solar azimuth angle to determine the position of the Sun as observed from a given location on the ...
In many countries, the seasons of the year are defined by reference to the solstices and the equinoxes. The term solstice can also be used in a broader sense, as the day when this occurs. For locations not too close to the equator or the poles, the dates with the longest and shortest periods of daylight are the summer and winter solstices ...
People nomadic; big wet-season camps breaking up. Systematic burning of all extensive grassed areas, communal drives for kangaroo, bandicoots, goanna. Fishing still important, with nets, grass barriers, in shallow waters on plains & salt pans. August to November (inclusive) is the most important period for ceremonial activities. Rarranhdharr ...
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