$$\def\|{&}\DeclareMathOperator{\D}{\bigtriangleup\!} \DeclareMathOperator{\d}{\text{d}\!}$$

The diagram below is explained further on the page for the year 2000.

For an explanation of the above pictures, see the page for the year 2000.

The last table on this page lists a number of noteworthy planetary phenomena during the listed year. The first column ("date") gives the date and hour, in the form year-month-dayThour in the Gregorian calendar, in Universal Time (UT). The second column ("pl") identifies the planet that shows the phenomenon:

pl Planet
Me Mercury
Ve Venus
Ma Mars
Ju Jupiter
Sa Saturn
Ur Uranus
Ne Neptune
Lu Moon

The third column ("*") provides the type of the phenomenon. The fourth column ("AU") shows the value (distance) in Astronomical Units, if applicable. The fifth column ("deg") gives the value of a relevant angle (declination $$δ$$, elongation $$E$$, conjunction spread $$σ$$, or ecliptic longitude $$λ$$) in degrees. Which angle it is for each phenomenon is shown below in column "?". Declinations and ecliptical longitudes are measured relative to the equinox of the date.

 ?
Explanation
p perigee
a apogee
+dδgreatest northern declination
−dδgreatest southern declination
cλconjunction (with the Sun)
oλopposition (relative to the Sun)
eEgreatest elongation
xaλpassage through the ascending node (zero ecliptical latitude)
xdλpassage through the descending node (zero ecliptical latitude)
bσleast conjunction spread (Mercury - Saturn)
Bσleast conjunction spread (Mercury - Neptune)
sσgreatest conjunction spread (Mercury - Saturn)
Sσgreatest conjunction spread (Mercury - Neptune)
Vλbegin eastward (prograde) acceleration
Pgλstationary point: begin eastward (prograde) motion
vλbegin westward (retrograde) acceleration
Rgλstationary point: begin westward (retrograde) motion

The calculations for the planets are based on the VSOP87 model (type A) of Laskar, and the calculations for the Moon are based on the most detailed model from [Meeus]. One position per day was calculated for each celestial object. The hour of the day for each phenomenon was determined by interpolation.

date pl *  AU deg
1931-01-03T08 Lu +d +28.20
1931-01-04T01 Lu o  +103.24
1931-01-04T20 Sa a  11.02
1931-01-05T01 Sa c  +284.26
1931-01-05T03 Ju p  4.211
1931-01-05T05 Sa v  +284.28
1931-01-05T15 Me c  +284.85
1931-01-05T19 Lu v  +129.43
1931-01-05T20 Me V  +284.53
1931-01-06T02 Lu p 0.002424
1931-01-06T03 Ju V  +105.48
1931-01-06T05 Ju o  +105.47
1931-01-06T10 Me p  0.6707
1931-01-08T16 Me +d −19.77
1931-01-10T14
**
b  +177.13
1931-01-10T15 Lu xd +199.03
1931-01-11T08
**
B  +189.51
1931-01-16T06 Lu −d −28.23
1931-01-16T15 Me Pg +276.05
1931-01-18T06 Lu c  +297.74
1931-01-22T01 Lu a 0.002713
1931-01-22T17 Lu V  +351.04
1931-01-24T22 Lu xa +17.21
1931-01-25T02 Ma p  0.6621
1931-01-26T08 Ma V  +127.27
1931-01-27T04
**
S  +279.87
1931-01-27T06 Ma o  +126.90
1931-01-28T09 Me e  −24.89
1931-01-30T18 Lu +d +28.31
1931-02-01T12 Me −d −21.94
1931-02-01T21 Ve e  −46.82
1931-02-02T12 Lu o  +133.21
1931-02-03T04 Lu v  +143.62
1931-02-03T10 Lu p 0.002394
1931-02-03T18 Me xa +290.41
1931-02-06T17 Lu xd +196.12
1931-02-12T11 Lu −d −28.39
1931-02-14T10 Ve −d −20.41
1931-02-16T06
**
s  +206.81
1931-02-17T01 Lu c  +327.93
1931-02-18T09 Lu a 0.002717
1931-02-19T03 Lu V  +352.71
1931-02-21T00 Lu xa +14.97
1931-02-21T21
**
B  +201.62
1931-02-23T06 Ne V  +154.41
1931-02-23T11 Ne o  +154.41
1931-02-24T02 Ne p  29.17
1931-02-24T12 Ma +d +24.47
1931-02-27T03 Lu +d +28.50
1931-03-03T18 Lu v  +160.50
1931-03-03T22 Lu o  +162.92
1931-03-03T22 Lu p 0.002384
1931-03-06T00
**
S  +296.15
1931-03-06T00 Lu xd +194.57
1931-03-06T19 Ju Pg +100.45
1931-03-08T01 Ma Pg +117.43
1931-03-09T01 Me a  1.370
1931-03-11T08 Ju +d +23.31
1931-03-11T17 Lu −d −28.55
1931-03-14T23 Me o  +353.47
1931-03-17T11 Lu a 0.002717
1931-03-17T14 Lu V  +343.49
1931-03-18T19 Lu c  +240.33
1931-03-20T05 Lu xa +14.32
1931-03-21T15 Me v  +6.71
1931-03-23T08
**
B  +163.06
1931-03-23T23 Ve xa +321.42
1931-03-25T09 Me xd +14.23
1931-03-26T11 Lu +d +28.60
1931-04-01T08 Lu v  +177.50
1931-04-01T09 Lu p 0.002395
1931-04-02T08 Lu o  +192.12
1931-04-02T11 Lu xd +194.36
1931-04-04T15
**
S  +219.15
1931-04-05T14 Ur c  +15.34
1931-04-05T19 Ur v  +15.35
1931-04-06T08 Ur a  21.00
1931-04-08T00 Lu −d −28.59
1931-04-09T19 Me e  +19.26
1931-04-13T18 Lu V  +342.10
1931-04-13T20 Lu a 0.002713
1931-04-16T11 Lu xa +14.44
1931-04-17T13 Lu c  +27.04
1931-04-17T19 Me +d +18.66
1931-04-19T07 Me Rg +43.41
1931-04-20T08
**
B  +146.05
1931-04-22T16 Lu +d +28.57
1931-04-29T14 Sa +d −21.20
1931-04-29T15 Lu p 0.002423
1931-04-29T18 Lu v  +192.36
1931-04-29T21 Lu xd +194.32
1931-04-29T22 Me c  +39.10
1931-04-30T13 Me V  +38.68
1931-05-01T17 Lu o  +220.86
1931-05-02T13 Me p  0.5600
1931-05-02T17 Me xa +37.28
1931-05-03T00
**
S  +203.53
1931-05-03T00 Sa Rg +293.28
1931-05-05T10 Lu −d −28.53
1931-05-11T12 Lu V  +347.28
1931-05-11T13 Lu a 0.002706
1931-05-13T02 Me Pg +33.58
1931-05-13T06 Ne +d +11.08
1931-05-13T18 Lu xa +13.98
1931-05-14T08 Ne Pg +153.00
1931-05-17T03 Lu c  +55.76
1931-05-17T05 Me −d +9.96
1931-05-18T01
**
B  +142.05
1931-05-19T22 Lu +d +28.46
1931-05-27T03 Lu xd +193.20
1931-05-27T03 Lu p 0.002457
1931-05-27T07 Me e  −24.72
1931-05-27T13 Lu v  +199.10
1931-05-31T02 Lu o  +249.18
1931-05-31T09
**
S  +196.27
1931-06-01T19 Lu −d −28.43
1931-06-08T07 Lu a 0.002701
1931-06-08T09 Lu V  +354.08
1931-06-09T22 Lu xa +12.16
1931-06-15T15 Lu c  +84.01
1931-06-16T04 Lu +d +28.39
1931-06-16T11
**
B  +134.19
1931-06-20T14 Lu v  +153.23
1931-06-21T09 Me xd +79.97
1931-06-21T13 Lu p 0.002470
1931-06-23T05 Lu xd +190.85
1931-06-27T23 Me v  +94.15
1931-06-28T23 Me o  +96.40
1931-06-29T02 Lu −d −28.38
1931-06-29T09 Me +d +24.51
1931-06-29T12 Lu o  +277.28
1931-06-30T05
**
S  +184.81
1931-06-30T16 Me a  1.328
1931-07-06T02 Lu a 0.002702
1931-07-06T07 Lu V  +0.90
1931-07-07T00 Lu xa +9.35
1931-07-12T19 Sa o  +289.96
1931-07-12T20 Ve +d +23.28
1931-07-12T23 Sa V  +289.95
1931-07-13T00 Sa p  9.002
1931-07-13T12 Lu +d +28.42
1931-07-15T00 Lu c  +112.04
1931-07-15T02 Ve xd +97.27
1931-07-16T00
**
B  +129.40
1931-07-17T11 Lu v  +147.84
1931-07-18T00 Lu p 0.002444
1931-07-20T06 Lu xd +188.06
1931-07-23T15 Ju v  +121.53
1931-07-23T22 Ur +d +6.98
1931-07-25T07 Ju c  +121.90
1931-07-25T08 Ur Rg +19.38
1931-07-26T08 Lu −d −28.46
1931-07-26T13 Ju a  6.283
1931-07-29T00 Lu o  +305.43
1931-07-29T17 Me xa +151.67
1931-07-30T07
**
S  +183.11
1931-08-02T19 Lu a 0.002708
1931-08-03T03 Lu xa +6.79
1931-08-03T03 Lu V  +7.04
1931-08-07T20 Me e  +27.34
1931-08-09T21 Lu +d +28.54
1931-08-13T08 Lu c  +140.11
1931-08-14T08
**
B  +129.37
1931-08-14T15 Lu v  +159.24
1931-08-14T21 Lu p 0.002412
1931-08-16T10 Lu xd +186.08
1931-08-21T20 Me Rg +169.69
1931-08-22T14 Lu −d −28.61
1931-08-24T05 Me −d +0.23
1931-08-27T15 Lu o  +333.86
1931-08-28T09
**
S  +182.30
1931-08-28T14 Ne a  31.17
1931-08-29T08 Ne c  +155.53
1931-08-29T12 Ne v  +155.53
1931-08-30T07 Lu xa +5.51
1931-08-30T08 Lu a 0.002714
1931-08-30T18 Lu V  +10.83
1931-09-01T15 Me p  0.6271
1931-09-03T17 Me V  +162.24
1931-09-04T08 Ve a  1.726
1931-09-04T12 Me c  +161.48
1931-09-05T09
**
b  +108.94
1931-09-06T06 Lu +d +28.69
1931-09-08T00 Ve o  +164.97
1931-09-09T07 Ma xa +204.99
1931-09-11T10
**
s  +109.08
1931-09-11T13
**
B  +129.90
1931-09-11T16 Lu c  +168.46
1931-09-12T03 Lu v  +175.12
1931-09-12T05 Lu p 0.002391
1931-09-12T19 Lu xd +185.41
1931-09-13T21 Me Pg +155.88
1931-09-17T08 Me xd +156.82
1931-09-18T02 Me +d +9.03
1931-09-18T19 Lu −d −28.72
1931-09-20T13 Me e  −17.84
1931-09-21T06 Sa Pg +286.65
1931-09-26T03
**
S  +185.57
1931-09-26T07 Lu o  +66.04
1931-09-26T13 Lu xa +5.39
1931-09-26T14 Lu a 0.002716
1931-09-26T15 Lu V  +6.80
1931-09-28T03 Sa −d −22.37
1931-10-03T14 Lu +d +28.72
1931-10-06T13 Me v  +184.11
1931-10-10T06 Lu xd +185.40
1931-10-10T12 Ur p  18.99
1931-10-10T16 Lu p 0.002388
1931-10-10T18 Lu v  +192.93
1931-10-11T00
**
B  +131.82
1931-10-11T01 Lu c  +197.26
1931-10-11T02 Ur V  +17.38
1931-10-11T04 Ur o  +17.38
1931-10-16T03 Lu −d −28.69
1931-10-17T23 Me o  +204.02
1931-10-18T05 Ve v  +215.07
1931-10-23T08 Lu V  +359.86
1931-10-23T17 Lu a 0.002714
1931-10-23T19 Ve V  +222.04
1931-10-23T19 Lu xa +5.38
1931-10-23T21 Sa xa +287.51
1931-10-25T01 Me a  1.435
1931-10-25T16 Me xa +216.70
1931-10-26T01 Lu o  +32.17
1931-10-26T12
**
S  +189.17
1931-10-30T19 Lu +d +28.63
1931-10-31T04
**
b  +96.21
1931-11-03T15 Ve xa +235.60
1931-11-06T16 Lu xd +184.89
1931-11-08T02 Lu p 0.002406
1931-11-08T08 Lu v  +210.35
1931-11-09T00 Ve v  +242.32
1931-11-09T10 Lu c  +226.58
1931-11-09T16
**
B  +136.65
1931-11-12T12 Lu −d −28.58
1931-11-19T20 Lu V  +2.60
1931-11-19T23 Lu xa +4.23
1931-11-20T05 Lu a 0.002709
1931-11-24T19 Lu o  +62.05
1931-11-25T18
**
S  +198.58
1931-11-27T01 Lu +d +28.50
1931-11-28T20 Me −d −25.85
1931-12-02T17 Me e  +21.21
1931-12-03T20 Lu xd +182.92
1931-12-03T23 Ve −d −24.60
1931-12-05T15 Ju −d +14.71
1931-12-06T05 Lu p 0.002440
1931-12-06T17 Lu v  +224.44
1931-12-07T22 Ne −d +9.28
1931-12-08T22 Lu c  +256.40
1931-12-09T04 Ju Rg +142.64
1931-12-09T13
**
B  +143.32
1931-12-09T22 Lu −d −28.47
1931-12-10T12 Ne Rg +157.99
1931-12-11T02 Ma −d −24.31
1931-12-11T08 Me Rg +276.40
1931-12-14T07 Me xd +275.59
1931-12-17T01 Lu xa +1.51
1931-12-17T18 Lu V  +9.56
1931-12-17T23 Lu a 0.002704
1931-12-20T21 Me c  +268.55
1931-12-20T23 Me V  +268.42
1931-12-21T04 Me p  0.6763
1931-12-23T07 Ur −d +5.49
1931-12-24T07 Lu +d +28.45
1931-12-24T11 Lu o  +92.20
1931-12-24T20
**
S  +208.55
1931-12-25T02 Ur Pg +15.44
1931-12-29T02 Me +d −20.01
1931-12-30T21 Lu xd +179.86
1931-12-31T05 Me Pg +260.10

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Last updated: 2021-07-19