A penumbral lunar eclipse will occur at the Moon’s ascending node of orbit on Sunday, July 18, 2027,[1] with an umbral magnitude of −1.0662. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A penumbral lunar eclipse occurs when part or all of the Moon's near side passes into the Earth's penumbra. Unlike a solar eclipse, which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of Earth. Occurring only about 16 hours before apogee (on July 19, 2027, at 7:50 UTC), the Moon's apparent diameter will be smaller.[2]
| Penumbral eclipse | |||||||||
 The Moon's hourly motion shown right to left | |||||||||
| Date | July 18, 2027 | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Gamma | −1.5759 | ||||||||
| Magnitude | −1.0662 | ||||||||
| Saros cycle | 110 (72 of 72) | ||||||||
| Penumbral | 11 minutes, 47 seconds | ||||||||
| |||||||||
The Moon will barely clip the edge of the Earth's penumbral shadow, and the eclipse will be impossible to see in practice. The event is listed as a miss by some sources.[3]
Visibility
editThe eclipse will be completely visible over Asia, east Africa, and Australia.[4]
|
Eclipse details
editShown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[5]
| Parameter | Value |
|---|---|
| Penumbral Magnitude | 0.00320 |
| Umbral Magnitude | −1.06620 |
| Gamma | −1.57589 |
| Sun Right Ascension | 07h51m14.4s |
| Sun Declination | +20°58'43.6" |
| Sun Semi-Diameter | 15'44.3" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 19h52m57.2s |
| Moon Declination | -22°20'25.3" |
| Moon Semi-Diameter | 14'43.0" |
| Moon Equatorial Horizontal Parallax | 0°54'00.6" |
| ΔT | 72.7 s |
Eclipse season
editThis 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. The first and last eclipse in this sequence is separated by one synodic month.
| July 18 Ascending node (full moon) |
August 2 Descending node (new moon) |
August 17 Ascending node (full moon) |
|---|---|---|
| |
 |
|
| Penumbral lunar eclipse Lunar Saros 110 |
Total solar eclipse Solar Saros 136 |
Penumbral lunar eclipse Lunar Saros 148 |
Related lunar eclipses
editEclipses in 2027
edit- An annular solar eclipse on February 6.
- A penumbral lunar eclipse on February 20.
- A penumbral lunar eclipse on July 18.
- A total solar eclipse on August 2.
- A penumbral lunar eclipse on August 17.
Metonic
edit- Followed by: Lunar eclipse of May 7, 2031
Tzolkinex
edit- Preceded by: Lunar eclipse of June 5, 2020
Half-Saros
edit- Preceded by: Solar eclipse of July 13, 2018
- Followed by: Solar eclipse of July 23, 2036
Tritos
edit- Preceded by: Lunar eclipse of August 18, 2016
- Followed by: Lunar eclipse of June 17, 2038
Lunar Saros 110
edit- Preceded by: Lunar eclipse of July 7, 2009
Inex
edit- Preceded by: Lunar eclipse of August 8, 1998
- Followed by: Lunar eclipse of June 27, 2056
Triad
edit- Followed by: Lunar eclipse of May 19, 2114
Lunar eclipses of 2027–2031
edit| Lunar eclipse series sets from 2027–2031 | ||||||||
|---|---|---|---|---|---|---|---|---|
| Ascending node | Descending node | |||||||
| Saros | Date Viewing |
Type Chart |
Gamma | Saros | Date Viewing |
Type Chart |
Gamma | |
| 110 | 2027 Jul 18
|
Penumbral
|
-1.57589 | 115 | 2028 Jan 12
|
Partial
|
0.98177 | |
| 120 | 2028 Jul 06
|
Partial
|
-0.79040 | 125 | 2028 Dec 31
|
Total
|
0.32583 | |
| 130 | 2029 Jun 26
|
Total
|
0.01240 | 135 | 2029 Dec 20
|
Total
|
-0.38110 | |
| 140 | 2030 Jun 15
|
Partial
|
0.75346 | 145 | 2030 Dec 09
|
Penumbral
|
-1.07315 | |
| 150 | 2031 Jun 05
|
Penumbral
|
1.47322 | |||||
| Last set | 2027 Aug 17 | Last set | 2027 Feb 20 | |||||
| Next set | 2031 May 07 | Next set | 2031 Oct 30 | |||||
Saros 110
editThis eclipse is a member of Saros series 110. The previous event occurred on July 7, 2009. This is the last lunar eclipse of this series.
Half-Saros cycle
editA lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[6] This lunar eclipse is related to two partial solar eclipses of Solar Saros 117.
| July 13, 2018 | July 23, 2036 |
|---|---|
|
|
See also
editNotes
edit- ^ "July 18–19, 2027 Almost Lunar Eclipse". timeanddate. Retrieved 19 November 2024.
- ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 19 November 2024.
- ^ "Almost Lunar Eclipse on July 18-19, 2027 – Where and when to See".
- ^ "Penumbral Lunar Eclipse of 2027 Jul 18" (PDF). NASA. Retrieved 19 November 2024.
- ^ "Penumbral Lunar Eclipse of 2027 Jul 18". EclipseWise.com. Retrieved 19 November 2024.
- ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
External links
edit- 2027 Jul 18 chart: Eclipse Predictions by Fred Espenak, NASA/GSFC
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