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lëvizje laike

Secular variations in the motions of the planets are those that have very slow changes that proceed through ages (secula) in a way such that they are nearly proportional with time for a relatively large number of years. Precession is considered a secular variation, arising from the motions of the mean equator and the mean ecliptic. Compare this with periodic variations, which are rather rapid changes; nutation is a periodic variation.

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Secteur d’activité/Domaine : Festivals Catégorie : Halloween

Halloween

Also known as All Hallow's Eve, Halloween is an annual holiday celebrated on October 31st in America, Canada, and the UK. It is supposedly the one day ...