Astronomy Answers: Planetary Phenomena 1971

Astronomy Answers
Planetary Phenomena 1971


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

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

1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105

[1971] [Q 1971]

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
1971-01-03T16 Me +d −20.22
1971-01-06T22
** 
S +144.84
1971-01-07T16 Me Pg +267.81
1971-01-08T09 Sa d +14.33
1971-01-08T23 Lu +d +27.80
1971-01-11T01 Lu o +110.67
1971-01-13T18 Lu xd +143.77
1971-01-15T23 Lu a 0.002709
1971-01-16T01 Lu V +171.09
1971-01-16T06 Ur d −4.71
1971-01-16T23 Sa Pg +45.69
1971-01-17T16 Ur Rg +193.56
1971-01-18T20 Me e −24.06
1971-01-20T11 Ve e −46.85
1971-01-21T20
** 
B +99.44
1971-01-23T11 Lu d −27.85
1971-01-26T10 Lu c +306.34
1971-01-27T07 Me d −22.61
1971-01-27T14 Lu xa +323.63
1971-01-27T15 Me xa +284.94
1971-01-27T20 Lu v +327.28
1971-01-27T22 Lu p 0.002410
1971-01-31T18
** 
b +115.18
1971-02-04T20
** 
S +153.05
1971-02-05T05 Lu +d +27.86
1971-02-09T19 Lu o +140.92
1971-02-10T01 Lu xd +143.61
1971-02-12T07 Ve d −20.81
1971-02-12T12 Lu a 0.002714
1971-02-12T15 Lu V +174.22
1971-02-19T05
** 
B +113.59
1971-02-19T21 Lu d −27.86
1971-02-24T01 Lu xa +323.65
1971-02-24T21 Lu c +336.14
1971-02-24T22 Ne d −19.13
1971-02-25T09 Lu p 0.002388
1971-02-25T11 Lu v +344.68
1971-02-27T03 Me a 1.382
1971-03-04T10 Lu +d +27.85
1971-03-05T01 Ne Rg +243.07
1971-03-05T22
** 
S +177.47
1971-03-05T23 Me o +345.02
1971-03-09T07 Lu xd +143.59
1971-03-09T09 Ma xa +268.46
1971-03-11T04 Lu V +165.98
1971-03-11T14 Lu o +170.87
1971-03-11T15 Lu a 0.002716
1971-03-13T09 Me v +359.40
1971-03-18T07 Me xd +8.99
1971-03-19T05 Lu d −27.77
1971-03-19T09 Ve xa +318.50
1971-03-19T11
** 
B +140.62
1971-03-19T15 Ma d −23.56
1971-03-20T01 Ju d −20.42
1971-03-22T22 Ju Rg +246.45
1971-03-23T11 Lu xa +323.07
1971-03-25T21 Lu p 0.002388
1971-03-26T01 Lu v +1.94
1971-03-26T07 Lu c +74.39
1971-03-31T12 Me e +18.81
1971-03-31T18 Lu +d +27.70
1971-04-01T04 Ur V +191.54
1971-04-01T09 Ur o +191.53
1971-04-02T03 Ur p 17.34
1971-04-03T05
** 
S +221.26
1971-04-05T10 Lu xd +142.44
1971-04-06T06
** 
s +137.56
1971-04-07T02 Lu V +162.14
1971-04-07T19 Lu a 0.002715
1971-04-08T21 Me +d +15.76
1971-04-09T05 Me Rg +33.76
1971-04-10T08 Lu o +200.30
1971-04-15T11 Lu d −27.57
1971-04-17T22
** 
B +160.93
1971-04-19T11 Me c +29.25
1971-04-19T17 Lu xa +321.11
1971-04-20T05 Me V +28.71
1971-04-22T14 Me p 0.5686
1971-04-23T05 Lu p 0.002408
1971-04-23T12 Lu v +17.19
1971-04-24T16 Lu c +34.32
1971-04-25T14 Me xa +25.22
1971-04-28T02 Lu +d +27.47
1971-04-29T10
** 
b +132.00
1971-05-01T16
** 
S +244.37
1971-05-02T12 Lu xd +139.92
1971-05-02T22 Me Pg +23.15
1971-05-04T19 Lu V +166.94
1971-05-05T09 Lu a 0.002709
1971-05-07T13 Me d +6.84
1971-05-09T23 Lu o +229.15
1971-05-12T16 Lu d −27.38
1971-05-15T07
** 
B +178.20
1971-05-16T18 Lu xa +318.23
1971-05-16T23 Sa c +55.94
1971-05-17T03 Sa a 10.12
1971-05-17T04 Me e −25.60
1971-05-17T12 Sa v +56.00
1971-05-21T04 Lu p 0.002440
1971-05-21T14 Lu v +27.64
1971-05-22T20 Ju o +241.59
1971-05-22T23 Ne o +241.70
1971-05-23T02 Ne V +241.70
1971-05-23T05 Ju V +241.54
1971-05-23T15 Ne p 29.31
1971-05-24T00 Lu c +62.70
1971-05-24T09 Ju p 4.352
1971-05-25T12 Lu +d +27.34
1971-05-29T15 Lu xd +137.03
1971-05-30T06
** 
S +295.35
1971-06-01T17 Lu V +173.98
1971-06-02T02 Lu a 0.002703
1971-06-08T12 Lu o +257.54
1971-06-08T22 Lu d −27.30
1971-06-09T21
** 
B +232.51
1971-06-12T19 Lu xa +315.80
1971-06-14T06 Me xd +74.98
1971-06-15T03 Ur +d −3.10
1971-06-15T20
** 
S +239.65
1971-06-16T21 Lu p 0.002469
1971-06-17T00 Ur Pg +189.43
1971-06-17T15 Lu v +24.25
1971-06-20T02 Me v +87.68
1971-06-21T00 Me o +89.61
1971-06-21T16 Me a 1.325
1971-06-21T20 Lu +d +27.32
1971-06-22T09 Lu c +90.82
1971-06-23T11 Ma +d −18.82
1971-06-24T00 Me +d +24.76
1971-06-25T19 Lu xd +135.09
1971-06-29T16 Lu V +181.42
1971-06-29T20 Lu a 0.002702
1971-06-30T15
** 
B +192.41
1971-07-06T05 Lu d −27.35
1971-07-07T22 Lu o +285.64
1971-07-10T00 Lu xa +314.66
1971-07-10T01 Ve +d +23.35
1971-07-10T12 Ve xd +95.02
1971-07-10T18 Ma Rg +321.95
1971-07-12T03 Lu p 0.002459
1971-07-12T05 Lu v +346.24
1971-07-12T12
** 
S +261.65
1971-07-18T18 Ju +d −18.61
1971-07-19T03 Lu +d +27.36
1971-07-21T21 Lu c +118.93
1971-07-22T13 Me xa +145.74
1971-07-23T02 Lu xd +134.50
1971-07-24T06 Ju Pg +236.59
1971-07-27T14 Lu V +188.67
1971-07-27T14 Lu a 0.002706
1971-07-28T03
** 
s +202.19
1971-07-28T16
** 
B +155.74
1971-07-29T06 Me e +27.16
1971-08-02T14 Lu d −27.39
1971-08-03T10 Ne +d −18.58
1971-08-06T07 Lu o +313.68
1971-08-06T09 Lu xa +314.52
1971-08-08T13 Lu p 0.002426
1971-08-08T14 Lu v +347.40
1971-08-09T18 Ma o +317.00
1971-08-10T03
** 
S +206.72
1971-08-10T13 Ma V +316.80
1971-08-11T14 Ma p 0.3757
1971-08-11T23 Ne Pg +240.30
1971-08-12T07 Me Rg +160.55
1971-08-15T08 Lu +d +27.39
1971-08-15T11 Me d +3.73
1971-08-19T10 Lu xd +134.57
1971-08-20T10 Lu c +147.26
1971-08-23T00 Me p 0.6166
1971-08-23T20 Ve a 1.729
1971-08-24T07 Lu a 0.002713
1971-08-24T10 Lu V +194.72
1971-08-24T19
** 
B +139.79
1971-08-25T07 Me V +153.46
1971-08-26T02 Me c +152.72
1971-08-26T23 Ve o +153.50
1971-08-27T19 Ma d −23.11
1971-08-30T00 Lu d −27.36
1971-09-02T19 Lu xa +314.43
1971-09-04T16 Lu o +341.95
1971-09-04T17 Me Pg +147.36
1971-09-05T16 Lu p 0.002398
1971-09-05T20 Lu v +359.54
1971-09-07T01
** 
S +193.60
1971-09-09T01 Ma Pg +311.89
1971-09-09T17 Me +d +11.64
1971-09-09T17 Sa +d +19.37
1971-09-10T05 Me xd +149.57
1971-09-11T14 Lu +d +27.31
1971-09-11T16 Me e −17.92
1971-09-15T15 Lu xd +134.13
1971-09-18T13 Sa Rg +66.53
1971-09-19T02 Lu c +176.00
1971-09-20T16 Lu V +194.69
1971-09-20T17 Lu a 0.002718
1971-09-22T21
** 
B +128.24
1971-09-26T07 Lu d −27.20
1971-09-27T21 Me v +176.36
1971-09-30T03 Lu xa +313.16
1971-10-04T00 Lu o +10.62
1971-10-04T02 Lu p 0.002384
1971-10-04T06 Lu v +14.27
1971-10-05T20
** 
S +172.59
1971-10-06T14 Ur a 19.35
1971-10-07T09 Ur c +193.96
1971-10-07T20 Ur v +193.99
1971-10-07T23 Me o +194.47
1971-10-08T21 Lu +d +27.11
1971-10-12T17 Lu xd +132.29
1971-10-15T13 Me a 1.426
1971-10-17T01 Lu V +184.20
1971-10-17T20 Lu a 0.002718
1971-10-18T13 Me xa +212.12
1971-10-18T19 Lu c +205.29
1971-10-20T23 Ve v +221.88
1971-10-21T09
** 
B +117.66
1971-10-23T13 Lu d −26.97
1971-10-27T07 Lu xa +310.51
1971-10-30T01 Ve xa +233.23
1971-11-01T14 Lu p 0.002392
1971-11-01T17 Lu v +29.53
1971-11-02T09 Lu o +39.78
1971-11-04T03
** 
S +167.69
1971-11-05T06 Lu +d +26.88
1971-11-08T18 Lu xd +129.26
1971-11-13T08 Lu V +184.85
1971-11-14T03 Lu a 0.002714
1971-11-17T13 Lu c +235.06
1971-11-19T05
** 
B +119.30
1971-11-19T18 Lu d −26.80
1971-11-23T07 Lu xa +307.49
1971-11-23T08 Me e +21.88
1971-11-23T16 Me d −25.73
1971-11-24T13 Ne a 31.31
1971-11-24T22 Ne v +242.79
1971-11-25T04 Sa V +63.04
1971-11-25T05 Ne c +242.80
1971-11-25T07 Sa p 8.088
1971-11-25T10 Sa o +63.02
1971-11-29T22 Lu p 0.002419
1971-11-30T00 Lu v +42.92
1971-12-01T07 Ve d −24.68
1971-12-01T19 Lu o +69.47
1971-12-02T14 Me Rg +268.26
1971-12-02T16 Lu +d +26.78
1971-12-03T05
** 
S +174.16
1971-12-04T22
** 
b +129.09
1971-12-05T22 Lu xd +126.52
1971-12-07T04 Me xd +266.33
1971-12-07T15 Ju a 6.290
1971-12-09T16 Ju c +257.44
1971-12-11T07 Lu V +192.64
1971-12-11T14 Ju v +257.88
1971-12-11T19 Lu a 0.002708
1971-12-12T08 Me c +260.18
1971-12-12T09 Me V +260.16
1971-12-12T09 Me p 0.6778
1971-12-17T00 Lu d −26.76
1971-12-17T02
** 
B +128.15
1971-12-17T07 Lu c +265.19
1971-12-20T09 Lu xa +305.58
1971-12-21T12 Me +d −19.30
1971-12-22T08 Me Pg +251.96
1971-12-23T04
** 
s +135.76
1971-12-27T16 Lu p 0.002457
1971-12-27T19 Lu v +49.35
1971-12-30T01 Lu +d +26.78
1971-12-31T08 Lu o +99.52
1971-12-31T10
** 
S +189.61



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