Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A tropical year (also known as a solar year) is the length of time that the Sun takes to return to the same position in the cycle of seasons, as seen from Earth; for example, the time from vernal equinox to vernal equinox, or from summer solstice to summer solstice. A tropical year can equivalently be defined as the time taken for the Sun's tropical longitude (longitudinal position along the ecliptic relative to its position at the vernal equinox) to increase by 360 degrees (that is, to complete one full seasonal circuit).
AmazonPagina's: 116, Paperback, Betascript Publishers
Prijshistorie
* Prijshistorie bevat geen data van Amazon, Amazon Marketplace.
Prijzen voor het laatst bijgewerkt op: