saros

/sair-os/US // ˈsɛər ɒs //UK // (ˈseɪrɒs) //

萨罗,萨罗人,萨罗斯,萨洛斯

Definitions

n.名词 noun

1
Astronomy.
- : the period of 223 synodic months, equaling 6585.32 days or 18 years, 11.32 days, after which eclipses repeat but are shifted 120° west.

This recurrence of eclipses after intervals of 18·03 years is called the Saros, and was known to the Chaldeans.
The discovery of the Saros was such as was within their power, and was certainly no small achievement.
But a given Saros eclipse in its successive reappearances undergoes other transformations besides that of Terrestrial longitude.
A new eclipse thus entering will at first be a very small one, but will be larger at every recurrence in each Saros.
The foregoing does not by any means exhaust all that can be said respecting the Saros even on the popular side.