Solar eclipse of October 1, 1921

{{Infobox solar eclipse|1921Oct01

| previous = Solar eclipse of April 8, 1921

| next = Solar eclipse of March 28, 1922

}}

A total solar eclipse occurred at the Moon's ascending node of orbit on Saturday, October 1, 1921,{{cite web|title=October 1, 1921 Total Solar Eclipse|url=https://www.timeanddate.com/eclipse/solar/1921-october-1|publisher=timeanddate|access-date=2 August 2024}} with a magnitude of 1.0293. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth. A total solar eclipse occurs when the Moon's apparent diameter is larger than the Sun's, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across Earth's surface, with the partial solar eclipse visible over a surrounding region thousands of kilometres wide. Occurring about 1.9 days after perigee (on September 29, 1921, at 14:50 UTC), the Moon's apparent diameter was larger.{{cite web|title=Moon Distances for London, United Kingdom, England|url=https://www.timeanddate.com/astronomy/moon/distance.html?year=1921&n=136|publisher=timeanddate|access-date=2 August 2024}}

Totality was visible from parts of Antarctica. A partial eclipse was visible for parts of South America and Antarctica.

Eclipse details

Shown below are two tables displaying details about this particular solar eclipse. The first table outlines times at which the moon's penumbra or umbra attains the specific parameter, and the second table describes various other parameters pertaining to this eclipse.{{cite web|title=Total Solar Eclipse of 1921 Oct 01|url=https://eclipsewise.com/solar/SEprime/1901-2000/SE1921Oct01Tprime.html|publisher=EclipseWise.com|access-date=2 August 2024}}

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|+October 1, 1921 Solar Eclipse Times

! Event

! Time (UTC)

First Penumbral External Contact

| 1921 October 01 at 10:27:26.7 UTC

First Umbral External Contact

| 1921 October 01 at 11:58:17.2 UTC

First Central Line

| 1921 October 01 at 12:00:11.9 UTC

First Umbral Internal Contact

| 1921 October 01 at 12:02:12.3 UTC

Ecliptic Conjunction

| 1921 October 01 at 12:26:22.9 UTC

Greatest Duration

| 1921 October 01 at 12:35:07.2 UTC

Greatest Eclipse

| 1921 October 01 at 12:35:58.1 UTC

Equatorial Conjunction

| 1921 October 01 at 13:07:31.9 UTC

Last Umbral Internal Contact

| 1921 October 01 at 13:09:22.8 UTC

Last Central Line

| 1921 October 01 at 13:11:21.2 UTC

Last Umbral External Contact

| 1921 October 01 at 13:13:14.0 UTC

Last Penumbral External Contact

| 1921 October 01 at 14:44:18.5 UTC

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|+October 1, 1921 Solar Eclipse Parameters

! Parameter

! Value

Eclipse Magnitude

| 1.02931

Eclipse Obscuration

| 1.05948

Gamma

| −0.93833

Sun Right Ascension

| 12h28m35.7s

Sun Declination

| -03°05'21.9"

Sun Semi-Diameter

| 15'58.8"

Sun Equatorial Horizontal Parallax

| 08.8"

Moon Right Ascension

| 12h27m27.1s

Moon Declination

| -03°58'54.5"

Moon Semi-Diameter

| 16'21.8"

Moon Equatorial Horizontal Parallax

| 1°00'03.1"

ΔT

| 22.4 s

Eclipse season

This eclipse is part of an eclipse season, a period, roughly every six months, when eclipses occur. Only two (or occasionally three) eclipse seasons occur each year, and each season lasts about 35 days and repeats just short of six months (173 days) later; thus two full eclipse seasons always occur each year. Either two or three eclipses happen each eclipse season. In the sequence below, each eclipse is separated by a fortnight.

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|+ Eclipse season of October 1921

! October 1
Ascending node (new moon) !! October 16
Descending node (full moon)

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| Total solar eclipse
Solar Saros 123

Partial lunar eclipse
Lunar Saros 135