Solar eclipse of April 8, 1921

{{Infobox solar eclipse|1921Apr08

| previous = Solar eclipse of November 10, 1920

| next = Solar eclipse of October 1, 1921

}}

An annular solar eclipse occurred at the Moon's descending node of orbit on Friday, April 8, 1921,{{cite web|title=April 8, 1921 Annular Solar Eclipse|url=https://www.timeanddate.com/eclipse/solar/1921-april-8|publisher=timeanddate|access-date=2 August 2024}} with a magnitude of 0.9753. 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. An annular solar eclipse occurs when the Moon's apparent diameter is smaller than the Sun's, blocking most of the Sun's light and causing the Sun to look like an annulus (ring). An annular eclipse appears as a partial eclipse over a region of the Earth thousands of kilometres wide. The Moon's apparent diameter was near the average diameter because it occurred 6.5 days after apogee (on April 1, 1921, at 20:50 UTC) and 8.3 days before perigee (on April 16, 1921, at 16:10 UTC).{{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}}

Annularity was visible from northern Scotland, northwestern tip of Norway, and islands in the Arctic Ocean in Russian SFSR. A partial eclipse was visible for parts of North Africa, Europe, Central Asia, and the Russian SFSR.

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=Annular Solar Eclipse of 1921 Apr 08|url=https://eclipsewise.com/solar/SEprime/1901-2000/SE1921Apr08Aprime.html|publisher=EclipseWise.com|access-date=2 August 2024}}

class="wikitable" align="{{{align|left}}}" style="margin:{{#ifeq:{{{align}}}|left|0 0 0.5em 1em|0 1em 0.5em 0}}"

|+April 8, 1921 Solar Eclipse Times

! Event

! Time (UTC)

First Penumbral External Contact

| 1921 April 8 at 06:51:44.6 UTC

First Umbral External Contact

| 1921 April 8 at 08:21:25.5 UTC

First Central Line

| 1921 April 8 at 08:23:38.1 UTC

Greatest Duration

| 1921 April 8 at 08:23:38.1 UTC

First Umbral Internal Contact

| 1921 April 8 at 08:25:55.2 UTC

Ecliptic Conjunction

| 1921 April 8 at 09:05:08.6 UTC

Greatest Eclipse

| 1921 April 8 at 09:15:01.3 UTC

Equatorial Conjunction

| 1921 April 8 at 09:44:56.4 UTC

Last Umbral Internal Contact

| 1921 April 8 at 10:03:48.2 UTC

Last Central Line

| 1921 April 8 at 10:06:02.5 UTC

Last Umbral External Contact

| 1921 April 8 at 10:08:12.1 UTC

Last Penumbral External Contact

| 1921 April 8 at 11:37:57.8 UTC

class="wikitable" align="{{{align|right}}}" style="margin:{{#ifeq:{{{align}}}|right|0 0 0.5em 1em|0 1em 0.5em 0}}"

|+April 8, 1921 Solar Eclipse Parameters

! Parameter

! Value

Eclipse Magnitude

| 0.97530

Eclipse Obscuration

| 0.95120

Gamma

| 0.88692

Sun Right Ascension

| 01h06m22.7s

Sun Declination

| +07°03'40.4"

Sun Semi-Diameter

| 15'58.0"

Sun Equatorial Horizontal Parallax

| 08.8"

Moon Right Ascension

| 01h05m24.3s

Moon Declination

| +07°51'45.1"

Moon Semi-Diameter

| 15'28.0"

Moon Equatorial Horizontal Parallax

| 0°56'45.6"

ΔT

| 22.3 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.

class="wikitable"

|+ Eclipse season of April 1921

! April 8
Descending node (new moon) !! April 22
Ascending node (full moon)

200px

align=center

| Annular solar eclipse
Solar Saros 118

Total lunar eclipse
Lunar Saros 130