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...lso, since perihelion and aphelion do not happen on the exact dates as the solstices, the maxima and minima are slightly asymmetrical. The rates of change befor ...of error. The circle approximation means the EL would be 90° ahead of the solstices in Earth's orbit (at the equinoxes), so that sin(EL) can be written as sin( ...

...s better able to detect the time of the equinoxes, compared to that of the solstices.{{sfn|Meeus|Savoie|1992|p=40}} ...ime of Hipparchus and Ptolemy, the year was based on two equinoxes (or two solstices) a number of years apart, to average out both observational errors and peri ...

....1966.tb03086.x |doi-access=free}}</ref> Earth's polar axis, and hence the solstices and equinoxes, precess with a period of about {{val|26000|fmt=commas}} year ...

...ables are several hours wrong with regard to the time of the equinoxes and solstices.}}</ref><ref>{{cite book |url=https://books.google.com/books?id=q2xxatst4OQ ...