Basic Lunar Events Synopsis Calculator

Basic 600-Year Lunar Events Synopsis Calculator
For Any Year/Month in the Range From 1600 to 2200 on the Standard Gregorian Calendar

Calendar Date (1600 to 2200)
Year and Month

Time Zone Offset
Neg | Pos = West | East
UT

NASA ΔT
Polynomial Estimate

BASIC LUNAR EVENTS SYNOPSIS For July of 2025 LT (Local Zone Time) Local Time Zone Offset = UT+00:00 = Same as UT/GMT THE BASIC LUNAR EVENTS ARE: The Lunar Phases : New Moons, First Quarter, Last Quarter and Full Moons Lunar Perigees : Minimum orbital distance Lunar Apogees : Maximum orbital distance Lunar Eclipses : Penumbral, partial and total eclipses max-points Local Time Zone Offset = UT+00:00 = Same as UT/GMT Julian_Date_TT Calendar_Date Time_GMT Lunar_Event ---------------- ------------------------ ----------------------------------- 2460859.31343344 2025 Jul 02 Wed 19:30:06 First Quarter Moon 2460861.60409682 2025 Jul 05 Sat 02:28:39 Lunar Apogee at 404626.589 km 2460867.35968565 2025 Jul 10 Thu 20:36:42 Full Moon 2460874.52695923 2025 Jul 18 Fri 00:37:34 Last Quarter Moon 2460877.08063973 2025 Jul 20 Sun 13:54:52 Lunar Perigee at 368041.368 km 2460881.30024570 2025 Jul 24 Thu 19:11:06 New Moon ============================================================================== SOME SPECIAL NOTES Geocentric coordinates are for the true equator, ecliptic and equinox of the date. These are the raw geocentric sky coordinates or the values tabulated in the astronomical almanacs prior to any local topocentric corrections. The lunar phase images slightly vary in size because they are scaled according to the geocentric lunar distance at the time of the event relative to the mean distance of 384402 km (238856 mi) = 100.000 percent. Meaning of apparent lunar size percentages: 100.000 % mean = Apparent size of Moon at mean distance of 384402 km. 107.977 % mean = Moon appears 7.977 percent larger than at mean distance. 97.404 % mean = Moon appears 97.404 percent of its size at mean distance. This program uses a cookie with the name: PHPSL_Lunar_Events_Synopsis_Settings The cookie remembers the interface settings between calls for up to 30 days. If you navigate to another page or shut down the browser and return later, the previous settings will be recalled from the cookie unless the cookie was deleted. If the cookie is idle for 30 days or more, then it will be automatically expired. It is updated to current on each program call. ============================================================================== BELOW ARE THE EPHEMERIS STATISTICS FOR THE LUNAR EVENTS LISTED ABOVE IN LOCAL TIME ZONE OFFSET UT+00:00 = Same as UT/GMT

First Quarter Moon Julian_Date Time_Scale Calendar_Date Time JD_Number ------------------- ---------------- --------------- ------------ --------- 2460859.31256534 LT LOCAL DATE/TIME 2025 Jul 02 Wed 19:30:06 LT 2460859 +0.00000000 TZ Time Zone +00:00:00 TZ 2460859.31256534 UT Universal Time 2025 Jul 02 Wed 19:30:06 UT 2460859 +0.00086806 DT NASA Delta T +00:01:15 DT 2460859.31343340 TT Terrestrial Time 2025 Jul 02 Wed 19:31:21 TT 2460859 ----------------------------------------------------------------------------- Geocentric Distance Right_Ascension Declination Light_Time Phase_Ang Ang_Diam --------------- --------------- --------------- --------- ---------- 12h 38m 18.147s -6° 01' 23.67" 249427.224 mi 90.000° 29' 46.05" 12.6383742 h -6.023243° 401414.206 km 0.4961257° 189° 34' 32.21" 0.002683288 AU 189.575613° 1.339 s -----------------------------------------------------------------------------

N



First Quarter Moon
401414.206 km
249427.224 mi

Phase:  90.000°
Ang Diam: 29' 46.05"
Semidiam: 14' 53.03"
Size:  95.762 % mean

Lunar Apogee at 404626.589 km = 251423.306 mi Julian_Date Time_Scale Calendar_Date Time JD_Number ------------------- ---------------- --------------- ------------ --------- 2460861.60322874 LT LOCAL DATE/TIME 2025 Jul 05 Sat 02:28:39 LT 2460862 +0.00000000 TZ Time Zone +00:00:00 TZ 2460861.60322874 UT Universal Time 2025 Jul 05 Sat 02:28:39 UT 2460862 +0.00086806 DT NASA Delta T +00:01:15 DT 2460861.60409680 TT Terrestrial Time 2025 Jul 05 Sat 02:29:54 TT 2460862 ----------------------------------------------------------------------------- Geocentric Distance Right_Ascension Declination Light_Time Phase_Ang Ang_Diam --------------- --------------- --------------- --------- ---------- 14h 18m 51.111s -17° 48' 47.93" 251423.306 mi 115.000° 29' 31.87" 14.3141976 h -17.813314° 404626.589 km 0.4921869° 214° 42' 46.67" 0.002704762 AU 214.712964° 1.350 s ----------------------------------------------------------------------------- Phase appearance: Waxing gibbous, just past first quarter moon.

N



Apogee
404626.589 km
251423.306 mi

Phase: 115.000°
Ang Diam: 29' 31.87"
Semidiam: 14' 45.94"
Size:  95.002 % mean

Full Moon Julian_Date Time_Scale Calendar_Date Time JD_Number ------------------- ---------------- --------------- ------------ --------- 2460867.35881764 LT LOCAL DATE/TIME 2025 Jul 10 Thu 20:36:42 LT 2460867 +0.00000000 TZ Time Zone +00:00:00 TZ 2460867.35881764 UT Universal Time 2025 Jul 10 Thu 20:36:42 UT 2460867 +0.00086806 DT NASA Delta T +00:01:15 DT 2460867.35968570 TT Terrestrial Time 2025 Jul 10 Thu 20:37:57 TT 2460867 ----------------------------------------------------------------------------- Geocentric Distance Right_Ascension Declination Light_Time Phase_Ang Ang_Diam --------------- --------------- --------------- --------- ---------- 19h 24m 19.313s -26° 30' 35.51" 242789.696 mi 180.000° 30' 34.88" 19.4053647 h -26.509863° 390732.140 km 0.5096890° 291° 04' 49.69" 0.002611883 AU 291.080470° 1.303 s -----------------------------------------------------------------------------

N



Full Moon
390732.140 km
242789.696 mi

Phase: 180.000°
Ang Diam: 30' 34.88"
Semidiam: 15' 17.44"
Size:  98.380 % mean

Last Quarter Moon Julian_Date Time_Scale Calendar_Date Time JD_Number ------------------- ---------------- --------------- ------------ --------- 2460874.52609114 LT LOCAL DATE/TIME 2025 Jul 18 Fri 00:37:34 LT 2460875 +0.00000000 TZ Time Zone +00:00:00 TZ 2460874.52609114 UT Universal Time 2025 Jul 18 Fri 00:37:34 UT 2460875 +0.00086806 DT NASA Delta T +00:01:15 DT 2460874.52695920 TT Terrestrial Time 2025 Jul 18 Fri 00:38:49 TT 2460875 ----------------------------------------------------------------------------- Geocentric Distance Right_Ascension Declination Light_Time Phase_Ang Ang_Diam --------------- --------------- --------------- --------- ---------- 01h 30m 41.896s +12° 43' 05.74" 230101.598 mi 270.000° 32' 16.06" 01.5116379 h +12.718260° 370312.626 km 0.5377939° 22° 40' 28.45" 0.002475387 AU 22.674568° 1.235 s -----------------------------------------------------------------------------

N



Last Quarter Moon
370312.626 km
230101.598 mi

Phase: 270.000°
Ang Diam: 32' 16.06"
Semidiam: 16' 08.03"
Size: 103.805 % mean

Lunar Perigee at 368041.368 km = 228690.304 mi Julian_Date Time_Scale Calendar_Date Time JD_Number ------------------- ---------------- --------------- ------------ --------- 2460877.07977164 LT LOCAL DATE/TIME 2025 Jul 20 Sun 13:54:52 LT 2460877 +0.00000000 TZ Time Zone +00:00:00 TZ 2460877.07977164 UT Universal Time 2025 Jul 20 Sun 13:54:52 UT 2460877 +0.00086806 DT NASA Delta T +00:01:15 DT 2460877.08063970 TT Terrestrial Time 2025 Jul 20 Sun 13:56:07 TT 2460877 ----------------------------------------------------------------------------- Geocentric Distance Right_Ascension Declination Light_Time Phase_Ang Ang_Diam --------------- --------------- --------------- --------- ---------- 03h 55m 53.425s +25° 21' 41.52" 228690.304 mi 304.023° 32' 28.01" 03.9315070 h +25.361532° 368041.368 km 0.5411128° 58° 58' 21.38" 0.002460205 AU 58.972605° 1.228 s ----------------------------------------------------------------------------- Phase appearance: Waning morning crescent moon.

N



Perigee
368041.368 km
228690.304 mi

Phase: 304.023°
Ang Diam: 32' 28.01"
Semidiam: 16' 14.00"
Size: 104.445 % mean

New Moon Julian_Date Time_Scale Calendar_Date Time JD_Number ------------------- ---------------- --------------- ------------ --------- 2460881.29937764 LT LOCAL DATE/TIME 2025 Jul 24 Thu 19:11:06 LT 2460881 +0.00000000 TZ Time Zone +00:00:00 TZ 2460881.29937764 UT Universal Time 2025 Jul 24 Thu 19:11:06 UT 2460881 +0.00086806 DT NASA Delta T +00:01:15 DT 2460881.30024570 TT Terrestrial Time 2025 Jul 24 Thu 19:12:21 TT 2460881 ----------------------------------------------------------------------------- Geocentric Distance Right_Ascension Declination Light_Time Phase_Ang Ang_Diam --------------- --------------- --------------- --------- ---------- 08h 21m 16.446s +23° 20' 25.52" 233818.317 mi 359.999° 31' 45.28" 08.3545683 h +23.340423° 376294.106 km 0.5292453° 125° 19' 06.69" 0.002515371 AU 125.318525° 1.255 s -----------------------------------------------------------------------------

N



New Moon
376294.106 km
233818.317 mi

Phase: 359.999°
Ang Diam: 31' 45.28"
Semidiam: 15' 52.64"
Size: 102.155 % mean

PROGRAM INFO:

BASIC 600-YEAR LUNAR EVENTS SYNOPSIS CALCULATOR FOR ANY MONTH

A PHP 7.x Astronomy Program by Jay Tanner - 2025
http://www.NeoProgrammics.com

This program simply gives a quick general synopsis of the dates and times of
all basic lunar events for any given month in the 600-year period from 1600
to 2200 on the Gregorian calendar.

THE BASIC LUNAR EVENTS ARE:
The Lunar Phases : New Moons, First Quarter, Last Quarter and Full Moons
Lunar Perigees   : Minimum orbital distance
Lunar Apogees    : Maximum orbital distance
Lunar Eclipses   : Penumbral, partial and total eclipses max-points

The computations are based on the NASA/JPL DE405 ephemeris model and the NASA
polynomial expressions for remote Delta T estimation, to the nearest second.

The lunar eclipse times are based on the Eclipse Predictions by Fred Espenak,
NASA GSFC Emeritus.

The basic events are computed for three time scales (LT, UT and TT).
TZ = Local Time Zone Offset From UT (Neg/Pos = West/East)
LT = Local Time in the given TZ
UT = Universal Time (UT1/GMT)
TT = Standard Astronomical Atomic-Based Time Scale (Ephemeris Time)

=====
NOTES

DT = NASA polynomial Delta T estimate, to the nearest second.
LT = UT + (TZ)
UT = LT − (TZ)
TT = UT + (DT)

If TZ = UT±00:00, then LT = Same as UT

The lunar phase images slightly vary in size because they are scaled according
to the geocentric lunar distance at the time of the event relative to the mean
distance of 384402 km (238856 mi) = 100.000 percent.

Meaning of apparent lunar size percentages:
100.000 % mean = Apparent size of Moon at mean distance of 384402 km.
106.898 % mean = Moon appears 6.898 percent larger than at mean distance.
 98.109 % mean = Moon appears 98.109 percent of its size at mean distance.

==============================================================================
REFERENCES:

NASA/JPL DEVELOPMENT (DExxx) EPHEMERIS MODELS
https://en.wikipedia.org/wiki/Jet_Propulsion_Laboratory_Development_Ephemeris
ftp://ssd.jpl.nasa.gov/pub/eph/planets/README.txt

ECLIPSES
https://eclipse.gsfc.nasa.gov/lunar.html

DELTA T ESTIMATION
https://eclipse.gsfc.nasa.gov/SEcat5/deltatpoly.html
https://eclipse.gsfc.nasa.gov/SEhelp/deltaT.html
https://eclipse.gsfc.nasa.gov/SEcat5/deltat.html

Program by Jay Tanner Revised: Thursday, January 01, 1970 at 12:00 AM UTC