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

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
1921-01-02T13 Lu xa +214.16
1921-01-03T08 Ju Rg +168.91
1921-01-03T21 Sa Rg +174.80
1921-01-04T13 Me −d −24.56
1921-01-06T04
**
B  +178.14
1921-01-06T12 Lu −d −19.47
1921-01-08T13 Lu V  +286.49
1921-01-08T17 Lu c  +288.44
1921-01-08T21 Lu a 0.002719
1921-01-09T23 Me a  1.433
1921-01-15T23 Me o  +295.66
1921-01-17T04 Lu xd +32.27
1921-01-20T18 Lu +d +19.37
1921-01-23T01 Lu p 0.002385
1921-01-23T02 Lu v  +118.01
1921-01-23T11 Lu o  +123.44
1921-01-25T02
**
S  +333.40
1921-01-28T05 Ve xd +354.58
1921-01-29T14 Lu xa +211.03
1921-01-29T18 Me v  +319.28
1921-02-01T06 Ne o  +132.37
1921-02-01T12 Ne V  +132.36
1921-02-01T16 Ne p  29.08
1921-02-02T19 Lu −d −19.30
1921-02-04T06 Lu V  +280.06
1921-02-04T16
**
s  +210.82
1921-02-04T23 Lu a 0.002717
1921-02-07T12 Lu c  +318.74
1921-02-09T08 Ve e  +46.75
1921-02-10T16 Me xd +339.13
1921-02-13T05 Lu xd +29.23
1921-02-14T00
**
B  +179.61
1921-02-14T20 Me e  +18.10
1921-02-17T03 Lu +d +19.17
1921-02-20T12 Lu p 0.002405
1921-02-20T12 Lu v  +132.55
1921-02-21T11 Me Rg +347.75
1921-02-21T21 Lu o  +153.24
1921-02-24T01 Me +d −2.11
1921-02-24T06 Ur c  +335.63
1921-02-24T08 Ur v  +335.64
1921-02-25T06 Ur a  21.05
1921-02-25T18 Lu xa +208.35
1921-02-26T18
**
S  +260.48
1921-02-28T06
**
b  +194.66
1921-03-02T02 Lu −d −19.07
1921-03-02T14 Me c  +341.97
1921-03-03T08 Me V  +341.19
1921-03-04T03 Lu V  +286.79
1921-03-04T14 Ju o  +163.97
1921-03-04T14 Lu a 0.002711
1921-03-04T18 Ju V  +163.95
1921-03-04T20 Ju p  4.426
1921-03-05T11 Me p  0.6221
1921-03-08T08
**
s  +195.57
1921-03-09T06 Lu c  +348.65
1921-03-11T21 Sa V  +171.43
1921-03-11T22 Sa p  8.434
1921-03-12T00 Sa o  +171.42
1921-03-12T07 Lu xd +27.47
1921-03-14T15
**
B  +171.16
1921-03-15T20 Me Pg +333.47
1921-03-16T10 Lu +d +18.97
1921-03-20T12 Lu p 0.002440
1921-03-20T13 Lu v  +142.12
1921-03-21T01 Me xa +334.73
1921-03-21T20 Me −d −9.80
1921-03-23T08 Lu o  +182.66
1921-03-25T02 Lu xa +207.20
1921-03-27T11
**
S  +238.62
1921-03-27T18 Ma xd +32.20
1921-03-29T11 Lu −d −18.92
1921-03-29T18 Me e  −27.78
1921-03-31T23 Ve Rg +40.27
1921-04-01T04 Lu V  +295.84
1921-04-01T09 Lu a 0.002705
1921-04-03T22 Ve +d +21.55
1921-04-07T21 Lu c  +18.00
1921-04-08T13 Lu xd +27.14
1921-04-12T07
**
B  +151.69
1921-04-12T15 Lu +d +18.89
1921-04-16T01 Lu v  +131.25
1921-04-16T02 Lu p 0.002471
1921-04-21T09 Ne Pg +130.96
1921-04-21T11 Lu xa +207.18
1921-04-21T19 Lu o  +211.65
1921-04-22T02 Ve V  +32.10
1921-04-22T04 Ve p  0.2852
1921-04-22T05 Ve c  +32.03
1921-04-22T08 Ne +d +17.55
1921-04-24T15
**
S  +202.06
1921-04-25T19 Lu −d −18.90
1921-04-29T04 Lu a 0.002702
1921-04-29T07 Lu V  +304.90
1921-05-03T00 Ju +d +9.47
1921-05-05T12 Ju Pg +158.93
1921-05-05T22 Lu xd +27.17
1921-05-07T09 Lu c  +46.73
1921-05-08T04 Me a  1.326
1921-05-09T16 Me xd +48.59
1921-05-09T22 Lu +d +18.92
1921-05-10T00 Me o  +49.30
1921-05-10T10
**
B  +133.76
1921-05-11T05 Lu v  +101.73
1921-05-11T08 Lu p 0.002458
1921-05-11T19 Me v  +53.27
1921-05-13T12 Ve Pg +23.87
1921-05-16T04 Sa +d +6.85
1921-05-18T18 Lu xa +207.00
1921-05-19T18 Ve xa +24.60
1921-05-20T08 Sa Pg +167.97
1921-05-21T08 Lu o  +240.20
1921-05-23T04 Lu −d −18.96
1921-05-23T17
**
S  +179.46
1921-05-24T17 Ve −d +9.34
1921-05-26T22 Lu a 0.002706
1921-05-27T08 Lu V  +313.29
1921-05-30T04 Me +d +25.65
1921-06-02T06 Lu xd +26.36
1921-06-05T18 Lu c  +74.98
1921-06-06T08 Lu +d +18.98
1921-06-07T19 Lu v  +105.22
1921-06-07T20 Lu p 0.002425
1921-06-08T01
**
B  +121.12
1921-06-10T19 Me e  +24.18
1921-06-11T20 Ur +d −8.68
1921-06-13T20 Ur Rg +339.64
1921-06-14T22 Lu xa +205.64
1921-06-17T00 Me xa +108.72
1921-06-19T12 Lu −d −19.00
1921-06-19T21 Lu o  +268.50
1921-06-20T09 Ma +d +24.22
1921-06-21T11
**
S  +166.38
1921-06-23T13 Lu a 0.002712
1921-06-24T05 Lu V  +320.10
1921-06-24T12 Me Rg +110.85
1921-06-28T18 Ma c  +96.96
1921-06-29T11 Lu xd +24.21
1921-07-01T06 Ve e  −45.65
1921-07-03T19 Lu +d +18.96
1921-07-05T01 Lu c  +102.95
1921-07-05T03 Me p  0.5656
1921-07-05T23 Lu v  +116.49
1921-07-06T00
**
B  +111.63
1921-07-06T00 Lu p 0.002398
1921-07-07T02 Me V  +105.86
1921-07-07T17 Me c  +105.48
1921-07-08T19 Me −d +17.85
1921-07-11T23 Lu xa +203.07
1921-07-16T19 Lu −d −18.93
1921-07-18T17 Me Pg +101.15
1921-07-18T22 Ma a  2.618
1921-07-19T09
**
S  +157.05
1921-07-19T12 Lu o  +296.73
1921-07-20T22 Lu a 0.002716
1921-07-21T16 Lu V  +322.58
1921-07-26T13 Lu xd +21.32
1921-07-28T15 Me e  −19.58
1921-07-31T06 Lu +d +18.83
1921-08-03T02 Me +d +21.02
1921-08-03T07 Lu v  +130.09
1921-08-03T08 Lu c  +130.91
1921-08-03T08
**
B  +103.41
1921-08-03T09 Lu p 0.002387
1921-08-05T13 Ne a  31.09
1921-08-05T15 Me xd +116.32
1921-08-05T19 Ne v  +133.48
1921-08-06T00 Ne c  +133.49
1921-08-08T01 Lu xa +200.25
1921-08-11T07 Ve +d +21.50
1921-08-13T02 Lu −d −18.76
1921-08-17T00 Lu a 0.002716
1921-08-17T04 Lu V  +313.69
1921-08-17T09
**
S  +146.77
1921-08-17T13 Me v  +138.93
1921-08-18T03 Lu o  +325.11
1921-08-22T14 Lu xd +19.01
1921-08-23T00 Me o  +149.86
1921-08-27T15 Lu +d +18.64
1921-08-28T21 Me a  1.374
1921-08-30T05 Ur p  19.06
1921-08-31T03 Ur o  +337.65
1921-08-31T04 Ur V  +337.65
1921-08-31T16 Lu v  +144.53
1921-08-31T19 Lu p 0.002396
1921-09-01T03
**
B  +97.06
1921-09-01T15 Lu c  +159.12
1921-09-04T07 Lu xa +198.45
1921-09-09T09 Lu −d −18.58
1921-09-09T21 Ve xd +131.15
1921-09-12T23 Me xa +187.05
1921-09-13T03 Lu V  +310.36
1921-09-13T08 Lu a 0.002712
1921-09-15T22
**
S  +145.36
1921-09-16T19 Lu o  +244.16
1921-09-18T18 Lu xd +18.06
1921-09-20T14
**
b  +40.29
1921-09-21T01 Sa c  +178.01
1921-09-21T04 Sa a  10.49
1921-09-21T10 Sa v  +178.05
1921-09-21T13 Ju a  6.448
1921-09-22T10 Ju c  +179.35
1921-09-23T18 Ju v  +179.64
1921-09-23T22 Lu +d +18.50
1921-09-28T23 Lu v  +157.65
1921-09-29T01 Lu p 0.002421
1921-09-29T21
**
B  +98.81
1921-10-01T00 Lu c  +187.79
1921-10-01T17 Lu xa +198.03
1921-10-06T17 Lu −d −18.49
1921-10-07T05 Me e  +25.23
1921-10-10T05
**
s  +41.59
1921-10-10T21 Lu V  +315.65
1921-10-10T22 Lu a 0.002706
1921-10-14T18
**
S  +148.11
1921-10-16T01 Lu xd +18.07
1921-10-16T10 Lu o  +23.04
1921-10-18T05 Me −d −19.75
1921-10-19T11 Me Rg +226.30
1921-10-21T03 Lu +d +18.50
1921-10-26T17 Lu v  +163.40
1921-10-26T18 Lu p 0.002457
1921-10-28T16
**
B  +97.35
1921-10-29T03 Lu xa +198.05
1921-10-29T19 Me p  0.6712
1921-10-30T11 Lu c  +217.03
1921-10-30T14 Me V  +217.88
1921-10-30T22 Me c  +217.47
1921-11-01T14 Me xd +215.36
1921-11-03T02 Lu −d −18.52
1921-11-07T18 Lu a 0.002703
1921-11-07T22 Lu V  +323.67
1921-11-08T01
**
b  +22.95
1921-11-08T23 Me Pg +210.41
1921-11-10T14 Me +d −9.70
1921-11-12T02
**
S  +143.91
1921-11-12T09 Lu xd +17.82
1921-11-13T00 Ur −d −10.14
1921-11-14T22 Ur Pg +335.71
1921-11-15T01 Lu o  +52.67
1921-11-16T04 Me e  −19.30
1921-11-16T18 Ne −d +16.15
1921-11-17T10 Lu +d +18.58
1921-11-18T03 Ne Rg +135.97
1921-11-20T03 Lu v  +123.43
1921-11-20T22 Lu p 0.002473
1921-11-25T08
**
B  +99.90
1921-11-25T09 Lu xa +197.27
1921-11-29T01 Lu c  +246.82
1921-11-30T12 Lu −d −18.62
1921-12-05T15 Lu a 0.002704
1921-12-06T00 Lu V  +332.52
1921-12-09T15 Lu xd +16.17
1921-12-09T23 Me xa +248.41
1921-12-11T09
**
S  +156.60
1921-12-14T14 Lu o  +82.62
1921-12-14T20 Lu +d +18.64
1921-12-17T01 Lu v  +118.09
1921-12-17T10 Lu p 0.002441
1921-12-22T10 Lu xa +194.95
1921-12-23T13 Me a  1.446
1921-12-23T18
**
B  +116.22
1921-12-26T23 Me o  +275.13
1921-12-27T06 Me −d −25.00
1921-12-27T21 Lu −d −18.65
1921-12-28T17 Lu c  +276.99
1921-12-29T05 Ve v  +267.56
1921-12-30T11 Ve xa +269.10

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Last updated: 2020-10-14