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July 1999 lunar eclipse

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July 1999 lunar eclipse
Partial eclipse
The Moon's hourly motion shown right to left
DateJuly 28, 1999
Gamma0.7863
Magnitude0.3966
Saros cycle119 (61 of 83)
Partiality142 minutes, 32 seconds
Penumbral310 minutes, 56 seconds
Contacts (UTC)
P18:58:15
U110:22:31
Greatest11:33:43
U412:45:03
P414:09:11

A partial lunar eclipse occurred at the Moon’s descending node of orbit on Wednesday, July 28, 1999,[1] with an umbral magnitude of 0.3966. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A partial lunar eclipse occurs when one part of the Moon is in the Earth's umbra, while the other part is in 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 about 5.2 days after apogee (on July 23, 1999, at 6:45 UTC), the Moon's apparent diameter was smaller.[2]

Visibility

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The eclipse was completely visible over eastern Australia, Antarctica, and much of the Pacific Ocean, seen rising over east and southeast Asia and western Australia and setting over much of North and South America.[3]

Eclipse details

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Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[4]

July 28, 1999 Lunar Eclipse Parameters
Parameter Value
Penumbral Magnitude 1.43423
Umbral Magnitude 0.39658
Gamma 0.78630
Sun Right Ascension 08h29m15.8s
Sun Declination +19°01'23.5"
Sun Semi-Diameter 15'45.0"
Sun Equatorial Horizontal Parallax 08.7"
Moon Right Ascension 20h28m49.2s
Moon Declination -18°18'03.0"
Moon Semi-Diameter 15'10.7"
Moon Equatorial Horizontal Parallax 0°55'42.5"
ΔT 63.7 s

Eclipse season

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See also: Eclipse cycle

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.

Eclipse season of July–August 1999
July 28
Descending node (full moon)
 August 11
Ascending node (new moon)
Partial lunar eclipse
Lunar Saros 119		 Total solar eclipse
Solar Saros 145
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Eclipses in 1999

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Metonic

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Tzolkinex

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Half-Saros

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Tritos

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Lunar Saros 119

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Inex

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Triad

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Lunar eclipses of 1998–2002

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This eclipse is a member of a semester series. An eclipse in a semester series of lunar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.[5]

The penumbral lunar eclipses on March 13, 1998 and September 6, 1998 occur in the previous lunar year eclipse set, and the penumbral lunar eclipses on May 26, 2002 and November 20, 2002 occur in the next lunar year eclipse set.

Lunar eclipse series sets from 1998 to 2002
Descending node   Ascending node
Saros Date
Viewing 		Type
Chart 		Gamma Saros Date
Viewing 		Type
Chart 		Gamma
109 1998 Aug 08
 Penumbral
 1.4876 114 1999 Jan 31
 Penumbral
 −1.0190
119 1999 Jul 28
 Partial
 0.7863 124
 2000 Jan 21
 Total
 −0.2957
129 2000 Jul 16
 Total
 0.0302 134
 2001 Jan 09
 Total
 0.3720
139 2001 Jul 05
 Partial
 −0.7287 144 2001 Dec 30
 Penumbral
 1.0732
149 2002 Jun 24
 Penumbral
 −1.4440

Saros 119

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This eclipse is a part of Saros series 119, repeating every 18 years, 11 days, and containing 82 events. The series started with a penumbral lunar eclipse on October 14, 935 AD. It contains partial eclipses from May 18, 1296 through August 2, 1422; total eclipses from August 13, 1440 through June 15, 1927; and a second set of partial eclipses from June 25, 1945 through August 19, 2035. The series ends at member 82 as a penumbral eclipse on March 25, 2396.

The longest duration of totality was produced by member 49 at 102 minutes, 6 seconds on March 30, 1801. All eclipses in this series occur at the Moon’s descending node of orbit.[6]

Greatest First
The greatest eclipse of the series occurred on 1801 Mar 30, lasting 102 minutes, 6 seconds.[7] Penumbral Partial Total Central
934 Oct 14
 1296 May 18
 1440 Aug 13
 1512 Sep 25
Last
Central Total Partial Penumbral
1873 May 12
 1927 Jun 15
 2035 Aug 19
 2396 Mar 25

Eclipses are tabulated in three columns; every third eclipse in the same column is one exeligmos apart, so they all cast shadows over approximately the same parts of the Earth.

Half-Saros cycle

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A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[8] This lunar eclipse is related to two total solar eclipses of Solar Saros 126.

July 22, 1990 August 1, 2008

See also

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References

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  1. ^ "July 27–28, 1999 Partial Lunar Eclipse". timeanddate. Retrieved 9 January 2025.
  2. ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 9 January 2025.
  3. ^ "Partial Lunar Eclipse of 1999 Jul 28" (PDF). NASA. Retrieved 9 January 2025.
  4. ^ "Partial Lunar Eclipse of 1999 Jul 28". EclipseWise.com. Retrieved 9 January 2025.
  5. ^ van Gent, R.H. "Solar- and Lunar-Eclipse Predictions from Antiquity to the Present". A Catalogue of Eclipse Cycles. Utrecht University. Retrieved 6 October 2018.
  6. ^ "NASA - Catalog of Lunar Eclipses of Saros 119". eclipse.gsfc.nasa.gov.
  7. ^ Listing of Eclipses of series 119
  8. ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
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