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Monthly Observing Information


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This page provides charts, and text concerning what is visible in the night sky during the month noted. All information is for Baton Rouge, Louisiana, but they can still provide useful information for most other areas of the U.S.A. Sky charts, Saturn ring plane, and Venus phase images are for Midnight, on the 15th day of the month. Sky charts are 100 degree field of view, and show objects down to 12th magnitude. Times in the Astronomy Lab 2 text information are in 24 hour format and have been adjusted for Daylight Savings Time. Subtract 12 hours from those over 12 to get the equivalent PM. RA and DEC given are for Epoch 2000.

NOTE: If you print this page out using your browser, be sure it is set to print black text or the background, or the white text will not print at all.

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Baton Rouge Clear Sky Clock
Click on image for more info and details. This clock is for the Baton Rouge area only.

Baton Rouge Clear Sky Clock

Telescope line

May

Moon Calendar

Moon Calendar

Sky charts

View/download sky chart north image View/download sky chart south image

View/download sky chart east image View/download sky chart west image

North South East West

Saturn’s Ring Plane

Saturn ring plane image

Venus Phase

Venus phase image

Sun and Moon Rise and Set

                                                      Begin     End
  Date       Moonrise   Moonset   Sunrise   Sunset   Twilight  Twilight
------------ --------- --------- --------- --------- --------- ---------

5/1/2021         00:07     10:20     06:21     19:43     04:53     21:11
5/2/2021         01:07     11:24     06:20     19:44     04:52     21:12
5/3/2021         01:57     12:27     06:19     19:45     04:51     21:13
5/4/2021         02:40     13:30     06:18     19:45     04:50     21:14
5/5/2021         03:17     14:28     06:17     19:46     04:49     21:15
5/6/2021         03:49     15:25     06:16     19:47     04:48     21:16
5/7/2021         04:19     16:19     06:16     19:47     04:47     21:17
5/8/2021         04:47     17:14     06:15     19:48     04:46     21:18
5/9/2021         05:15     18:07     06:14     19:49     04:45     21:19
5/10/2021        05:43     19:01     06:13     19:49     04:44     21:19
5/11/2021        06:13     19:55     06:13     19:50     04:43     21:20
5/12/2021        06:47     20:51     06:12     19:51     04:42     21:21
5/13/2021        07:24     21:46     06:11     19:51     04:41     21:22
5/14/2021        08:06     22:41     06:11     19:52     04:40     21:23
5/15/2021        08:53     23:33     06:10     19:52     04:39     21:24
5/16/2021        09:46    ------     06:09     19:53     04:38     21:25
5/17/2021        10:42     00:22     06:09     19:54     04:37     21:26
5/18/2021        11:42     01:06     06:08     19:54     04:36     21:27
5/19/2021        12:42     01:47     06:08     19:55     04:35     21:28
5/20/2021        13:45     02:24     06:07     19:56     04:35     21:29
5/21/2021        14:48     02:59     06:07     19:56     04:34     21:30
5/22/2021        15:53     03:33     06:06     19:57     04:33     21:30
5/23/2021        17:00     04:07     06:06     19:57     04:32     21:31
5/24/2021        18:10     04:44     06:05     19:58     04:32     21:32
5/25/2021        19:23     05:24     06:05     19:59     04:31     21:33
5/26/2021        20:36     06:10     06:05     19:59     04:30     21:34
5/27/2021        21:47     07:03     06:04     20:00     04:30     21:35
5/28/2021        22:52     08:02     06:04     20:00     04:29     21:35
5/29/2021        23:49     09:07     06:04     20:01     04:29     21:36
5/30/2021       ------     10:13     06:03     20:01     04:28     21:37
5/31/2021        00:36     11:18     06:03     20:02     04:28     21:38

'------' means the event does not occur on this date.


Object       Right ascensio Declination   Azimuth       Altitude      Earth distance  Sun distance    
------------ -------------- ------------- ------------- ------------- --------------- --------------- 
Sun          03h 28m 56.3s  +18° 54' 54"  341° 26' 11"  -38° 29' 40"                0               0 
Mercury      04h 59m 32.6s  +25° 08' 50"  322° 37' 14"  -23° 35' 32"      131,114,854      57,084,338 
Venus        04h 22m 45.4s  +21° 47' 18"  328° 39' 09"  -30° 55' 16"      249,627,165     107,698,621 
Mars         06h 58m 02.5s  +24° 11' 09"  302° 08' 37"  -05° 19' 11"      318,951,264     246,684,206 
Jupiter      22h 10m 02.6s  -12° 10' 22"   87° 55' 50"  -28° 03' 10"      755,314,059     755,852,360 
Saturn       21h 04m 27.0s  -17° 22' 02"  100° 50' 20"  -16° 23' 08"    1,454,062,353   1,490,676,360 
Uranus       02h 36m 48.1s  +14° 53' 54"  356° 57' 45"  -44° 36' 02"    3,102,317,543   2,955,219,581 
Neptune      23h 35m 04.3s  -03° 53' 18"   65° 34' 28"  -41° 24' 22"    4,545,978,068   4,476,646,981 
Pluto        19h 56m 16.1s  -22° 13' 51"  113° 04' 27"  -04° 42' 37"    5,055,970,839   5,128,380,841 
Moon         06h 04m 50.7s  +24° 43' 09"  310° 29' 35"  -14° 13' 05"          402,739               0 

Object       Rise:  Tran  Set: Phase   Constl    Magnitud 
------------ ----- ----- ----- ------- --------- -------- 
Sun          05:11 12:01 18:52   0.00%       Tau  unknown 
Mercury      06:24 13:31 20:39  41.93%       Tau      0.2 
Venus        05:57 12:54 19:52  97.47%       Tau     -3.9 
Mars         08:27 15:31 22:34  94.39%       Gem      1.6 
Jupiter      01:12 06:45 12:17  99.00%       Aqr     -2.4 
Saturn       00:20 05:39 10:59  99.75%       Cap      0.6 
Uranus       04:33 11:11 17:49 100.00%       Ari      5.9 
Neptune      02:17 08:10 14:02  99.98%       Aqr      7.9 
Pluto        23:20 04:30 09:36  99.98%       Sgr     14.3 
Moon         07:06 14:21 21:38  10.20%       Gem  unknown 

Moon Data
---------
Distance (km):                402,738.9
Distance (miles):             250,251.0
True Equatorial:              06h 07m 39.5s +25° 19' 31" 
Angular diameter:               0° 29' 33" 
Total libration (l,b):          4° 35' 55"  ,  2° 23' 18" 
Optical libration:              4° 33' 59"  ,  2° 25' 23" 
Physical libration:             0° 01' 56"  ,  0° 02' 05" 
Position Angle:                 2° 13' 35" 
Pos. angle (bright limb):     142° 44' 26" 
Phase angle:                    2° 13' 35" 
Age:                          3.42

Mars Data
---------
Declination of earth:           7° 35' 52" 
Declination of Sun:            17° 37' 07" 
Longitude of the central Meridian: 22° 24' 37" 
Pos. Angle:                   340° 30' 12" 

Jupiter Data
-----------------
Declination of earth:           0° 29' 37" 
Declination of Sun:             0° 03' 39" 
Longitude of the central Meridian:123° 21' 27" 
Pos. Angle:                   337° 08' 08" 

Saturn Data
---------
Declination of earth:          16° 45' 19" 
Declination of Sun:            18° 55' 47" 
Longitude of the central Meridian:  0° 00' 00" 
Pos. Angle:                     6° 39' 43" 


Name                          Month/Day    RA         Decl       Hourly Rate
----------------------------- ------------ ---------- ---------- -----------
Phi Bootids                        05/01        16.0       51.0         6
Alpha Scorpiids                    05/03        16.0      -22.0         6
Eta Aquarids                       05/03        22.4       -1.9        60

Information for this section is from TheSkyX Student Edition

                         Lunar Eclipse Report for 2021

Lunar eclipse on  5/26/2021
Moon rise: 20:37
Moon set:   6:10
Magnitude:  1.01
Partial phase begins:     4:49
Total phase begins:       6:14
Time of maximum eclipse:  6:22
Total phase ends:         6:30
Partial phase ends:       7:55


              Planet View Info Report for  5/ 1/2021 to  5/31/2021

                                    Mercury

Date       Rise  Set     RA         Dec         Elongation   Ill Fr  DIST(AU)

 5/ 1/2021  7:02 20:53    3h25m32s   20°14'47"   13°22'39"   0.833    1.18815
 5/ 8/2021  7:16 21:25    4h17m16s   23°39'51"   19°05'33"   0.624    1.03803
 5/15/2021  7:25 21:40    4h58m32s   25°07'58"   21°50'21"   0.425    0.88090
 5/22/2021  7:24 21:36    5h25m47s   25°01'11"   21°11'11"   0.258    0.74139
 5/29/2021  7:10 21:13    5h36m44s   23°45'27"   16°49'25"   0.123    0.63318

                                     Venus

Date       Rise  Set     RA         Dec         Elongation   Ill Fr  DIST(AU)

 5/ 1/2021  6:54 20:26    3h10m50s   17°25'14"    9°12'51"   0.987    1.69780
 5/ 8/2021  6:55 20:40    3h45m49s   19°47'52"   11°02'32"   0.982    1.68488
 5/15/2021  6:58 20:54    4h21m43s   21°44'29"   12°53'03"   0.975    1.66916
 5/22/2021  7:03 21:07    4h58m23s   23°11'29"   14°44'14"   0.967    1.65059
 5/29/2021  7:10 21:19    5h35m37s   24°05'58"   16°35'47"   0.958    1.62925

                                      Mars

Date       Rise  Set     RA         Dec         Elongation   Ill Fr  DIST(AU)

 5/ 1/2021  9:41 23:53    6h20m06s   24°48'19"   53°43'34"   0.934    2.02086
 5/ 8/2021  9:33 23:43    6h38m49s   24°34'21"   51°12'13"   0.939    2.07676
 5/15/2021  9:26 23:33    6h57m31s   24°12'00"   48°42'46"   0.944    2.13055
 5/22/2021  9:18 23:22    7h16m07s   23°41'26"   46°15'14"   0.948    2.18204
 5/29/2021  9:11 23:11    7h34m35s   23°02'52"   43°49'22"   0.953    2.23118

                                    Jupiter

Date       Rise  Set     RA         Dec         Elongation   Ill Fr  DIST(AU)

 5/ 1/2021  2:58 14:01   22h03m00s  -12°45'25"   72°31'43"   0.991    5.26801
 5/ 8/2021  2:33 13:37   22h06m38s  -12°27'15"   78°22'28"   0.990    5.16130
 5/15/2021  2:08 13:14   22h09m50s  -12°11'29"   84°19'03"   0.990    5.05235
 5/22/2021  1:43 12:49   22h12m32s  -11°58'20"   90°21'52"   0.990    4.94236
 5/29/2021  1:17 12:24   22h14m43s  -11°48'02"   96°31'30"   0.990    4.83256

                                     Saturn

Date       Rise  Set     RA         Dec         Elongation   Ill Fr  DIST(AU)

 5/ 1/2021  2:10 12:49   21h03m03s  -17°26'03"   87°43'42"   0.997    9.97410
 5/ 8/2021  1:43 12:22   21h03m56s  -17°23'17"   94°17'51"   0.997    9.85734
 5/15/2021  1:16 11:55   21h04m30s  -17°21'52"  100°55'32"   0.998    9.74155
 5/22/2021  0:49 11:28   21h04m45s  -17°21'50"  107°36'38"   0.998    9.62839
 5/29/2021  0:21 11:00   21h04m41s  -17°23'10"  114°21'16"   0.998    9.51940

                                     Uranus

Date       Rise  Set     RA         Dec         Elongation   Ill Fr  DIST(AU)

 5/ 1/2021  6:22 19:36    2h33m35s   14°38'41"    0°26'05"   1.000   20.76568
 5/ 8/2021  5:56 19:10    2h35m10s   14°46'15"    6°33'13"   1.000   20.75961
 5/15/2021  5:29 18:45    2h36m44s   14°53'40"   12°54'46"   1.000   20.74033
 5/22/2021  5:03 18:19    2h38m17s   15°00'55"   19°15'41"   1.000   20.70816
 5/29/2021  4:37 17:53    2h39m47s   15°07'53"   25°36'08"   1.000   20.66358

                                    Neptune

Date       Rise  Set     RA         Dec         Elongation   Ill Fr  DIST(AU)

 5/ 1/2021  4:07 15:52   23h33m48s   -4°00'58"   48°27'38"   1.000   30.58368
 5/ 8/2021  3:40 15:25   23h34m29s   -3°56'51"   55°03'37"   1.000   30.49153
 5/15/2021  3:13 14:58   23h35m05s   -3°53'14"   61°39'39"   1.000   30.39143
 5/22/2021  2:46 14:31   23h35m36s   -3°50'11"   68°15'43"   1.000   30.28481
 5/29/2021  2:19 14:04   23h36m03s   -3°47'42"   74°51'59"   1.000   30.17316

                                     Pluto

Date       Rise  Set     RA         Dec         Elongation   Ill Fr  DIST(AU)

 5/ 1/2021  1:16 11:29   19h56m32s  -22°11'16"  104°02'38"   1.000   34.01324
 5/ 8/2021  0:49 11:02   19h56m28s  -22°12'26"  110°50'56"   1.000   33.90412
 5/15/2021  0:21 10:34   19h56m17s  -22°13'51"  117°39'22"   1.000   33.80004
 5/22/2021 23:49 10:06   19h56m01s  -22°15'31"  124°27'44"   1.000   33.70263
 5/29/2021 23:22  9:38   19h55m39s  -22°17'23"  131°16'02"   1.000   33.61328


                               Planet Data Report

Planet       Mean Dist   Period of          Inclination     Equatorial
             From Sun    Revolution                         Diameter
             (AU)                                           (km)

Mercury       0.39        88    days         7°               4880
Venus         0.72       224.7  days         3.4°            12100
Earth         1.00       365.24 days         0°              12756
Mars          1.52       687    days         1.9°             6794
Jupiter       5.20        11.86 years        1.3°           143200
Saturn        9.54        29.46 years        2.5°           120000
Uranus       19.18        84    years        0.8°            52290
Neptune      30.06       165    years        1.8°            50450
Pluto        39.44       248    years       17.2°             2200-2300


                Moon Apsides Report for  5/ 1/2021 to  5/31/2021

Date          Hour    Apsis      Distance (km)    Diameter

 5/11/2021    17      Apogee     406507           0.4899°
 5/25/2021    21      Perigee    357322           0.5574°


                 Moon Nodes Report for  5/ 1/2021 to  5/31/2021

Date          Time     Node          Illuminated Fraction

 5/13/2021     5:28    Ascending     0.02
 5/26/2021    14:37    Descending    1.00


               Meteor Showers Report for  5/ 1/2021 to  5/31/2021

Date        Meteor Shower       ZHR  RA      DEC   Illum. Frac.  Longitude

 5/ 5/2021  eta-Aquarids        35   22h20m   -1°  0.30           45°
 5/12/2021  alpha-Scorpiids      5   16h04m  -24°  0.01           52°


                  Twilight Report for  5/ 1/2021 to  5/31/2021

Date         Sun            Astronomical   Nautical       Civil
             Rise   Set     Begin  End     Begin  End     Begin  End

 5/ 1/2021    6:21  19:43    4:50  21:14    5:21  20:43    5:51  20:13
 5/ 8/2021    6:15  19:48    4:42  21:21    5:14  20:49    5:45  20:18
 5/15/2021    6:10  19:52    4:35  21:28    5:08  20:54    5:40  20:23
 5/22/2021    6:06  19:57    4:29  21:34    5:03  21:00    5:36  20:28
 5/29/2021    6:04  20:01    4:25  21:40    5:00  21:05    5:33  20:32

Information for this section is from Astronomy Lab 2.03


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