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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

September

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

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

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


Object       Right ascensio Declination   Azimuth       Altitude      Earth distance  Sun distance    
------------ -------------- ------------- ------------- ------------- --------------- --------------- 
Sun          11h 32m 45.1s  +02° 56' 31"  334° 09' 01"  -53° 40' 16"                0               0 
Mercury      13h 06m 35.4s  -10° 03' 29"  291° 25' 27"  -48° 52' 29"      141,561,131      68,064,470 
Venus        14h 09m 18.6s  -14° 14' 14"  275° 30' 51"  -37° 53' 55"      150,394,410     108,853,955 
Mars         12h 01m 46.0s  +00° 41' 50"  321° 42' 53"  -52° 20' 39"      394,527,320     246,206,690 
Jupiter      21h 47m 10.1s  -14° 37' 37"  195° 19' 24"  +43° 36' 18"      615,074,172     750,683,616 
Saturn       20h 40m 11.9s  -19° 12' 11"  212° 16' 14"  +33° 26' 39"    1,377,360,689   1,487,253,347 
Uranus       02h 48m 44.0s  +15° 47' 21"   88° 37' 49"  +30° 06' 55"    2,857,570,015   2,952,721,125 
Neptune      23h 31m 35.5s  -04° 20' 32"  155° 27' 20"  +52° 28' 31"    4,325,910,948   4,476,309,146 
Pluto        19h 46m 35.0s  -22° 50' 51"  221° 46' 37"  +23° 26' 12"    5,059,682,594   5,140,588,570 
Moon         18h 41m 58.7s  -26° 37' 34"  230° 15' 10"  +10° 38' 23"          372,806               0 

Object       Rise:  Tran  Set: Phase   Constl    Magnitud 
------------ ----- ----- ----- ------- --------- -------- 
Sun          05:49 12:00 18:11   0.00%       Leo  unknown 
Mercury      07:55 13:34 19:13  55.30%       Vir      0.2 
Venus        09:07 14:36 20:05  68.08%       Vir     -4.1 
Mars         06:25 12:30 18:34  99.84%       Vir      1.7 
Jupiter      16:48 22:14 03:45  99.77%       Cap     -2.8 
Saturn       15:53 21:08 02:26  99.87%       Cap      0.4 
Uranus       20:35 03:19 09:59  99.96%       Ari      5.7 
Neptune      18:07 23:59 05:54 100.00%       Aqr      7.8 
Pluto        15:08 20:13 01:21  99.98%       Sgr     14.3 
Moon         13:55 19:01 00:08  65.17%       Sgr  unknown 

Moon Data
---------
Distance (km):                372,806.4
Distance (miles):             231,651.7
True Equatorial:              18h 45m 07.1s -25° 58' 48" 
Angular diameter:               0° 32' 10" 
Total libration (l,b):          3° 08' 53"  ,  3° 50' 27" 
Optical libration:              3° 07' 31"  ,  3° 49' 03" 
Physical libration:             0° 01' 22"  ,  0° 01' 24" 
Position Angle:                 5° 42' 25" 
Pos. angle (bright limb):      72° 20' 26" 
Phase angle:                    5° 42' 25" 
Age:                          8.17

Mars Data
---------
Declination of earth:          25° 41' 29" 
Declination of Sun:            24° 49' 58" 
Longitude of the central Meridian:262° 02' 13" 
Pos. Angle:                    26° 54' 40" 

Jupiter Data
-----------------
Declination of earth:           0° 39' 28" 
Declination of Sun:             0° 39' 01" 
Longitude of the central Meridian:115° 53' 56" 
Pos. Angle:                   338° 24' 02" 

Saturn Data
---------
Declination of earth:          19° 15' 18" 
Declination of Sun:            17° 38' 40" 
Longitude of the central Meridian:  0° 00' 00" 
Pos. Angle:                     6° 46' 27" 


Name                          Month/Day    RA         Decl       Hourly Rate
----------------------------- ------------ ---------- ---------- -----------
Aurigids                           09/01         5.7       42.0        30
Northern Tau Aquarids              09/20        21.8       -6.0        15
Southern Piscids                   09/20         0.4        0.0        10
Kappa Aquarids                     09/21        22.5       -5.0         5
Daytime Sextantids                 09/29        10.1        0.0        30
Southern Annual Andromedids        10/03         0.3        8.0        13

Information for this section is from TheSkyX Student Edition

              Planet View Info Report for  9/ 1/2021 to  9/30/2021

                                    Mercury

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

 9/ 1/2021  8:34 20:29   12h08m01s   -1°40'56"   23°44'00"   0.740    1.14648
 9/ 8/2021  8:48 20:22   12h39m39s   -6°10'50"   26°00'58"   0.659    1.05368
 9/15/2021  8:55 20:11   13h05m55s   -9°57'37"   26°44'40"   0.556    0.94950
 9/22/2021  8:51 19:54   13h23m59s  -12°35'32"   25°06'51"   0.417    0.83758
 9/29/2021  8:27 19:27   13h28m06s  -13°16'04"   19°33'38"   0.231    0.73046

                                     Venus

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

 9/ 1/2021  9:47 21:16   13h08m16s   -7°26'20"   39°47'10"   0.729    1.10804
 9/ 8/2021  9:58 21:10   13h38m10s  -10°52'47"   41°07'54"   0.706    1.05790
 9/15/2021 10:09 21:04   14h08m25s  -14°08'41"   42°23'25"   0.681    1.00685
 9/22/2021 10:20 21:00   14h39m09s  -17°10'10"   43°32'51"   0.656    0.95503
 9/29/2021 10:31 20:57   15h10m24s  -19°53'28"   44°34'59"   0.630    0.90263

                                      Mars

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

 9/ 1/2021  7:38 20:02   11h28m21s    4°24'16"   12°14'39"   0.996    2.62608
 9/ 8/2021  7:31 19:47   11h44m48s    2°35'12"    9°57'08"   0.997    2.63323
 9/15/2021  7:24 19:31   12h01m18s    0°45'02"    7°39'41"   0.998    2.63719
 9/22/2021  7:18 19:16   12h17m52s   -1°05'43"    5°22'34"   0.999    2.63805
 9/29/2021  7:11 19:01   12h34m33s   -2°56'32"    3°06'21"   1.000    2.63588

                                    Jupiter

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

 9/ 1/2021 18:43  5:43   21h53m15s  -14°06'02"  166°47'13"   0.999    4.03440
 9/ 8/2021 18:13  5:12   21h50m00s  -14°23'06"  159°11'00"   0.999    4.06582
 9/15/2021 17:44  4:41   21h47m04s  -14°38'03"  151°37'57"   0.998    4.11083
 9/22/2021 17:14  4:10   21h44m34s  -14°50'28"  144°10'03"   0.997    4.16845
 9/29/2021 16:45  3:40   21h42m34s  -15°00'00"  136°48'18"   0.995    4.23751

                                     Saturn

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

 9/ 1/2021 17:46  4:21   20h43m17s  -19°00'14"  149°22'31"   0.999    9.08098
 9/ 8/2021 17:18  3:52   20h41m45s  -19°06'21"  142°12'45"   0.999    9.14600
 9/15/2021 16:49  3:23   20h40m27s  -19°11'26"  135°05'12"   0.999    9.22253
 9/22/2021 16:21  2:54   20h39m25s  -19°15'24"  128°00'21"   0.998    9.30923
 9/29/2021 15:53  2:26   20h38m41s  -19°18'10"  120°58'18"   0.998    9.40473

                                     Uranus

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

 9/ 1/2021 22:27 11:51    2h49m35s   15°51'21"  114°03'50"   0.999   19.30848
 9/ 8/2021 21:59 11:23    2h49m14s   15°49'44"  120°56'18"   1.000   19.20365
 9/15/2021 21:31 10:55    2h48m44s   15°47'26"  127°52'25"   1.000   19.10623
 9/22/2021 21:03 10:27    2h48m05s   15°44'32"  134°51'58"   1.000   19.01772
 9/29/2021 20:35  9:58    2h47m20s   15°41'03"  141°55'03"   1.000   18.93946

                                    Neptune

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

 9/ 1/2021 19:59  7:47   23h33m03s   -4°11'01"  166°35'16"   1.000   28.94012
 9/ 8/2021 19:31  7:18   23h32m21s   -4°15'36"  173°30'27"   1.000   28.92132
 9/15/2021 19:03  6:50   23h31m39s   -4°20'14"  178°40'39"   1.000   28.91706
 9/22/2021 18:35  6:22   23h30m56s   -4°24'50"  172°16'22"   1.000   28.92742
 9/29/2021 18:07  5:53   23h30m14s   -4°29'17"  165°16'10"   1.000   28.95226

                                     Pluto

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

 9/ 1/2021 17:01  3:15   19h47m22s  -22°48'13"  135°47'13"   1.000   33.62264
 9/ 8/2021 16:33  2:47   19h46m56s  -22°49'40"  128°54'23"   1.000   33.71614
 9/15/2021 16:06  2:19   19h46m36s  -22°50'53"  122°01'16"   1.000   33.81870
 9/22/2021 15:38  1:51   19h46m21s  -22°51'51"  115°08'04"   1.000   33.92883
 9/29/2021 15:10  1:23   19h46m11s  -22°52'33"  108°14'34"   1.000   34.04506


                         Planet Apsides Report for 2021

Mercury
   9/ 5/2021  Aphelion     Distance from Sun:   0.47 AU


       Planet Conjunction/Opposition Report for  9/ 1/2021 to  9/30/2021

Neptune

  Date        Hour   Event

   9/14/2021   4     Opposition                         

   
                               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  9/ 1/2021 to  9/30/2021

Date          Hour    Apsis      Distance (km)    Diameter

 9/11/2021     5      Perigee    368480           0.5405°
 9/26/2021    17      Apogee     404657           0.4922°


                 Moon Nodes Report for  9/ 1/2021 to  9/30/2021

Date          Time     Node          Illuminated Fraction

 9/12/2021    11:34    Descending    0.35
 9/26/2021     2:32    Ascending     0.77


               Meteor Showers Report for  9/ 1/2021 to  9/30/2021

Date        Meteor Shower       ZHR  RA      DEC   Illum. Frac.  Longitude

 9/ 8/2021  Piscids             10    0h36m    7°  0.04          166°
 9/20/2021  Piscids              5    0h24m    0°  1.00          178°


                  Twilight Report for  9/ 1/2021 to  9/30/2021

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

 9/ 1/2021    6:42  19:27    5:15  20:54    5:45  20:24    6:13  19:55
 9/ 8/2021    6:45  19:19    5:20  20:44    5:49  20:15    6:17  19:47
 9/15/2021    6:49  19:10    5:25  20:34    5:53  20:06    6:21  19:38
 9/22/2021    6:53  19:01    5:29  20:25    5:58  19:57    6:25  19:29
 9/29/2021    6:57  18:52    5:34  20:16    6:02  19:48    6:29  19:20

Information for this section is from Astronomy Lab 2.03


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