Solar Saros 162 is one of the numbered series in the Saros cycle of solar eclipses. The Saros cycle is a period of approximately 18 years, 11 days, and 8 hours (6585.3211 days) that can be used to predict the recurrence of eclipses with very similar geometric configurations. Each Saros series is a long sequence of eclipses, typically lasting over a millennium, where the characteristics of the eclipses gradually change as the Moon's orbit precesses relative to the Earth and Sun.
Overview
Saros series 162 is a relatively new and long-lasting solar Saros series. It commenced in the 22nd century and is projected to continue into the 34th century. Eclipses within this particular series are characterized by their evolution from partial to central (specifically annular) and back to partial, following the general pattern of all Saros series. The Saros cycle ensures that successive eclipses in a series occur at roughly the same longitude and latitude on the Earth's surface, but shifted slightly westward due to the "eight hours" component of the cycle, which accounts for approximately one-third of the Earth's rotation.
Characteristics of Saros 162
- Duration: Saros 162 spans 1264 years, starting in 2106 and concluding in 3370.
- Number of Eclipses: It comprises a total of 74 solar eclipses.
- Type of Central Eclipses: All central eclipses in Saros 162 are annular solar eclipses. This means that during the maximum phase of these eclipses, the Moon's apparent diameter is smaller than the Sun's, resulting in a bright ring of sunlight (an annulus) visible around the silhouetted Moon.
- Geographic Progression: Like all Saros series, the path of annularity shifts slightly northward over the course of the series when the eclipses occur in the Northern Hemisphere, and southward for those in the Southern Hemisphere. The central track consistently shifts westward due to the one-third day offset inherent in the Saros period.
Eclipse Progression
A Saros series begins with partial solar eclipses occurring near one of Earth's poles (in this case, the Northern Hemisphere). As the series progresses over many centuries, the alignment of the Earth, Moon, and Sun becomes more direct, causing the eclipses to become central (annular for this series), and their paths move towards the equatorial regions. After reaching their peak centrality and covering more central latitudes, the eclipses gradually become partial again and eventually occur near the opposite pole (the Southern Hemisphere for Saros 162), before the series concludes.
Timeline of Saros 162
- First Eclipse: July 23, 2106 (Partial Solar Eclipse)
- First Annular Eclipse: November 21, 2222
- Last Annular Eclipse: February 11, 3254
- Last Eclipse: August 05, 3370 (Partial Solar Eclipse)
Significance
Understanding specific Saros series like 162 is crucial for astronomers and eclipse predictors. It allows for the precise forecasting of future eclipses and aids in studying long-term trends in the orbital mechanics of the Earth-Moon-Sun system. The predictable nature of the Saros cycle has been utilized for millennia, dating back to ancient civilizations, to anticipate and record astronomical events.