Partial Lunar Eclipse of 1921 Oct 16
Fred Espenak
Key to Lunar Eclipse Figure (below)
Introduction
The Partial Lunar Eclipse of 1921 Oct 16 is visible from the following geographic regions:
- Americas, Europe, Africa, Asia, western Australia
The diagram to the right depicts the Moon's path with respect to Earth's umbral and penumbral shadows. Below it is a map showing the geographic regions of eclipse visibility. Click on the figure to enlarge it. For an explanation of the features appearing in the figure, see Key to Lunar Eclipse Figures.
The instant of greatest eclipse takes place on 1921 Oct 16 at 22:53:59 TD (22:53:37 UT1). This is 5.5 days after the Moon reaches apogee. During the eclipse, the Moon is in the constellation Aries. The synodic month in which the eclipse takes place has a Brown Lunation Number of -15.
The eclipse belongs to Saros 135 and is number 18 of 71 eclipses in the series. All eclipses in this series occur at the Moons descending node. The Moon moves northward with respect to the node with each succeeding eclipse in the series and gamma increases.
This is a very deep partial eclipse. It has an umbral eclipse magnitude of 0.9317 and a partial eclipse duration of 199.1 minutes. Gamma has a value of -0.4902.
The partial lunar eclipse of 1921 Oct 16 is preceded two weeks earlier by a total solar eclipse on 1921 Oct 01.
These eclipses all take place during a single eclipse season.
The eclipse predictions are given in both Terrestrial Dynamical Time (TD) and Universal Time (UT1). The parameter ΔT is used to convert between these two times (i.e., TD = UT1 + ΔT). ΔT has a value of 22.5 seconds for this eclipse.
The following links provide maps and data for the eclipse.
- Detailed Lunar Eclipse Figure - eclipse geometry diagram and map of eclipse visibility (Key to Figure)
- Saros 135 Table - data for all eclipses in the Saros series
The tables below contain detailed predictions and additional information on the Partial Lunar Eclipse of 1921 Oct 16 .