Sky & Telescope - January 2025 - 54
JANUARY 2025 OBSERVING
Planetary Almanac
PLANET VISIBILITY (40°N, naked-eye, approximate) Mercury visible at dawn to the 12th *
Venus visible at dusk all month * Mars rises at dusk and is visible to dawn * Jupiter visible at dusk
and sets before morning twilight * Saturn high in southwest at dusk and sets in the evening.
Mercury
January Sun & Planets
Jan 1
Venus
Mercury
11
21
31
Sun
Date Right Ascension Declination Elongation Magnitude Diameter Illumination Distance
18h 45.5m
1
31
1
1
Mars
16
31
Venus
11
21
31
1
1
Jupiter
16
31
Mars
11
21
31
1
Jupiter
Saturn
16
Saturn
Uranus
Neptune
16
31
1
31
1
31
16
16
20h 53.9m
17h 14.8m
18h 14.6m
19h 20.3m
20h 28.8m
22h 00.2m
22h 38.9m
23h 13.5m
23h 43.6m
8h 19.0m
7h 55.1m
7h 31.1m
4h 46.0m
4h 37.8m
23h 04.8m
23h 15.1m
3h 22.7m
23h 51.8m
-23° 01′ - -26.8
-17° 28′ - -26.8
-21° 55′
-23° 37′
-23° 28′
-21° 04′
-13° 42′
-9° 11′
-4° 29′
+0° 10′
+23° 37′
+25° 10′
21° Mo
17° Mo
13° Mo
7° Mo
47° Ev
47° Ev
47° Ev
45° Ev
159° Mo
176° Mo
+26° 06′ 159° Ev
+21° 44′
+21° 36′
-8° 03′
-6° 55′
+18° 17′
-2° 17′
152° Ev
120° Ev
64° Ev
36° Ev
117° Ev
61° Ev
-0.4
-0.3
-0.5
-0.9
-4.5
-4.6
-4.7
-4.8
-1.2
-1.4
-1.1
-2.7
-2.5
+1.1
+1.1
+5.7
+7.9
32′ 32″ -
32′ 28″ -
5.9″
5.2″
4.9″
4.8″
22.2″
24.6″
27.7″
31.5″
14.3″
14.5″
13.8″
47.0″
43.5″
16.6″
16.0″
3.7″
2.2″
77%
88%
94%
98%
55%
51%
45%
39%
99%
100%
99%
100%
99%
0.983
0.985
1.148
1.289
1.375
1.411
0.751
0.677
0.603
0.530
0.657
0.644
0.680
4.191
4.529
100% 10.025
100% 10.401
100% 19.081
100% 30.351
16
Uranus
Neptune
10 "
Uranus
PLANET DISKS are presented
north up and with celestial west to the
right. Blue ticks indicate the pole currently
tilted toward Earth.
ORBITS OF THE PLANETS
The curved arrows show each planet's
movement during January. The outer
planets don't change position enough in
a month to notice at this scale.
Jupiter
Saturn
Neptune
March
equinox
Sun
Mercury
June
solstice
The table above gives each object's right ascension and declination (equinox 2000.0) at 0h Universal Time on selected dates,
and its elongation from the Sun in the morning (Mo) or evening (Ev) sky. Next are the visual magnitude and equatorial diameter.
(Saturn's ring extent is 2.27 times its equatorial diameter.) Last are the percentage of a planet's disk illuminated by the Sun and
the distance from Earth in astronomical units. (Based on the mean Earth-Sun distance, 1 a.u. equals 149,597,871 kilometers, or
92,955,807 international miles.) For other timely information about the planets, visit skyandtelescope.org.
Mars
December
solstice
Earth
Venus
Sept.
equinox
54
JANUARY 2025 * SKY & TELESCOPE
http://www.skyandtelescope.org
Sky & Telescope - January 2025
Table of Contents for the Digital Edition of Sky & Telescope - January 2025
Contents
Sky & Telescope - January 2025 - Cover1
Sky & Telescope - January 2025 - Cover2
Sky & Telescope - January 2025 - 1
Sky & Telescope - January 2025 - Contents
Sky & Telescope - January 2025 - 3
Sky & Telescope - January 2025 - 4
Sky & Telescope - January 2025 - 5
Sky & Telescope - January 2025 - 6
Sky & Telescope - January 2025 - 7
Sky & Telescope - January 2025 - 8
Sky & Telescope - January 2025 - 9
Sky & Telescope - January 2025 - 10
Sky & Telescope - January 2025 - 11
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Sky & Telescope - January 2025 - 25
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Sky & Telescope - January 2025 - Cover3
Sky & Telescope - January 2025 - Cover4
Sky & Telescope - January 2025 - SGA1
Sky & Telescope - January 2025 - SGA2
Sky & Telescope - January 2025 - SGA3
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Sky & Telescope - January 2025 - SGA5
Sky & Telescope - January 2025 - SGA6
Sky & Telescope - January 2025 - SGA7
Sky & Telescope - January 2025 - SGA8
Sky & Telescope - January 2025 - SGA9
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