Astronomy Answers: Planetary Phenomena 1917

Astronomy Answers
Planetary Phenomena 1917


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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

[1917] [Q 1917]

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
1917-01-03T05 Me e +19.34
1917-01-06T00 Lu +d +25.71
1917-01-07T17 Me xd +305.05
1917-01-08T07 Lu o +107.49
1917-01-08T12 Lu xd +109.85
1917-01-10T06 Me Rg +305.66
1917-01-10T08 Lu a 0.002715
1917-01-10T09 Lu V +132.24
1917-01-13T16
** 
S +259.93
1917-01-16T17 Me +d −17.18
1917-01-17T15 Sa p 8.078
1917-01-17T19 Sa o +117.13
1917-01-18T00 Sa V +117.12
1917-01-19T06 Me c +298.62
1917-01-19T06 Ve d −22.96
1917-01-19T14 Me V +298.15
1917-01-20T10 Lu d −25.69
1917-01-20T12 Me p 0.6630
1917-01-22T11 Lu xa +289.88
1917-01-23T07 Lu c +302.76
1917-01-23T12 Lu p 0.002385
1917-01-23T14 Lu v +307.15
1917-01-23T23 Ne V +123.49
1917-01-24T00 Ne o +123.49
1917-01-24T06 Ne p 29.04
1917-01-26T22 Ve v +284.31
1917-01-27T14
** 
B +172.63
1917-01-28T09 Ve xa +286.14
1917-01-30T20 Me Pg +289.64
1917-02-02T05 Lu +d +25.69
1917-02-04T18 Lu xd +109.81
1917-02-05T19 Lu V +122.31
1917-02-06T08 Lu a 0.002716
1917-02-07T03 Lu o +137.81
1917-02-09T00 Ur v +319.70
1917-02-09T00 Ur c +319.70
1917-02-09T22 Ur a 20.95
1917-02-10T12
** 
S +218.81
1917-02-10T22 Me d −20.34
1917-02-12T06 Ma v +326.61
1917-02-12T10 Me e −26.04
1917-02-15T01 Me xa +299.93
1917-02-16T19 Lu d −25.61
1917-02-18T21 Lu xa +289.26
1917-02-21T00 Lu p 0.002392
1917-02-21T06 Lu v +325.03
1917-02-21T18 Lu c +332.57
1917-02-25T23
** 
B +143.04
1917-02-28T21 Ma c +339.75
1917-03-01T12 Lu +d +25.53
1917-03-03T22 Lu xd +108.59
1917-03-05T00 Lu V +121.37
1917-03-05T15 Lu a 0.002713
1917-03-08T21 Lu o +167.77
1917-03-11T04
** 
S +173.53
1917-03-16T02 Lu d −25.39
1917-03-16T19 Pl Pg +92.33
1917-03-18T02 Lu xa +287.22
1917-03-21T08 Lu p 0.002417
1917-03-21T16 Lu v +340.07
1917-03-23T04 Lu c +300.09
1917-03-24T12 Me a 1.354
1917-03-26T00 Sa Pg +113.65
1917-03-26T16
** 
B +113.54
1917-03-28T20 Lu +d +25.28
1917-03-29T09 Sa +d +21.68
1917-03-29T11 Me o +8.01
1917-03-31T00 Lu xd +105.94
1917-04-01T20 Lu V +127.58
1917-04-02T07 Lu a 0.002707
1917-04-03T13 Me v +18.45
1917-04-05T16 Me xd +22.81
1917-04-07T13 Lu o +197.17
1917-04-09T11
** 
S +144.35
1917-04-10T21 Ma a 2.381
1917-04-12T07 Lu d −25.14
1917-04-12T22 Ne Pg +122.08
1917-04-14T02 Lu xa +284.26
1917-04-15T07 Ne +d +19.50
1917-04-18T02 Lu p 0.002452
1917-04-18T15 Lu v +348.64
1917-04-21T14 Lu c +30.88
1917-04-24T00
** 
B +94.65
1917-04-24T19 Me e +20.18
1917-04-25T05 Lu +d +25.06
1917-04-26T12 Ve o +35.71
1917-04-27T02 Lu xd +103.01
1917-04-28T23 Ve a 1.730
1917-04-29T19 Lu V +135.12
1917-04-30T02 Lu a 0.002702
1917-05-01T08 Me +d +22.39
1917-05-05T15 Me Rg +59.49
1917-05-07T02 Lu o +225.96
1917-05-07T18 Ju v +47.84
1917-05-08T06
** 
S +132.13
1917-05-09T11 Ju c +48.25
1917-05-09T13 Lu d −24.98
1917-05-11T04 Lu xa +281.87
1917-05-11T17 Ju a 6.005
1917-05-13T18 Lu p 0.002472
1917-05-14T01 Me xa +56.93
1917-05-14T14 Lu v +330.18
1917-05-16T20 Me c +55.35
1917-05-17T04 Me V +55.14
1917-05-18T08 Me p 0.5513
1917-05-21T00 Lu c +59.39
1917-05-21T12 Ve xd +66.53
1917-05-21T19
** 
B +87.53
1917-05-22T13 Lu +d +24.94
1917-05-24T07 Lu xd +101.17
1917-05-26T17 Ur +d −14.30
1917-05-27T18 Lu V +142.52
1917-05-27T21 Lu a 0.002702
1917-05-29T01 Ur Rg +323.71
1917-05-29T12 Me Pg +50.59
1917-06-01T09 Me d +14.28
1917-06-05T11
** 
S +129.21
1917-06-05T13 Lu o +254.27
1917-06-05T20 Lu d −24.94
1917-06-07T09 Lu xa +280.81
1917-06-08T19 Lu v +301.05
1917-06-08T20 Lu p 0.002448
1917-06-12T05 Me e −23.27
1917-06-12T15 Ve +d +24.25
1917-06-18T20 Lu +d +24.94
1917-06-19T02
** 
B +85.73
1917-06-19T13 Lu c +87.65
1917-06-20T14 Lu xd +100.68
1917-06-23T09 Ma xd +66.05
1917-06-24T07 Pl a 45.05
1917-06-24T14 Lu a 0.002708
1917-06-24T15 Lu V +149.04
1917-06-25T21 Pl v +93.92
1917-06-26T12 Pl o +93.93
1917-06-29T00
** 
b +48.62
1917-07-01T04 Pl +d +18.85
1917-07-02T15 Me xd +88.45
1917-07-03T06 Lu d −24.94
1917-07-04T05
** 
S +128.86
1917-07-04T19 Lu xa +280.73
1917-07-04T21 Lu o +282.29
1917-07-06T15 Lu p 0.002415
1917-07-06T17 Lu v +309.34
1917-07-07T19 Me +d +24.01
1917-07-10T11 Me v +104.93
1917-07-12T11 Me o +109.31
1917-07-15T01 Me a 1.335
1917-07-16T02 Lu +d +24.95
1917-07-17T07
** 
B +90.37
1917-07-17T21 Lu xd +100.77
1917-07-19T03 Lu c +115.86
1917-07-22T04 Lu a 0.002714
1917-07-22T05 Lu V +152.91
1917-07-27T06 Sa v +124.12
1917-07-27T20 Sa c +124.19
1917-07-27T22 Ne v +124.60
1917-07-27T23 Ne a 31.05
1917-07-28T01 Sa a 10.11
1917-07-28T06 Ne c +124.61
1917-07-30T16 Lu d −24.92
1917-07-31T15 Ma +d +23.87
1917-08-01T05 Lu xa +280.59
1917-08-02T06
** 
S +141.20
1917-08-03T05 Lu o +310.28
1917-08-03T22 Lu p 0.002392
1917-08-04T01 Lu v +323.07
1917-08-10T00 Me xa +160.93
1917-08-12T08 Lu +d +24.88
1917-08-14T01 Lu xd +100.26
1917-08-14T06 Ur p 18.97
1917-08-14T16
** 
B +106.66
1917-08-15T03 Ur o +321.73
1917-08-15T05 Ur V +321.73
1917-08-17T18 Lu c +144.23
1917-08-18T02 Lu V +148.15
1917-08-18T12 Lu a 0.002718
1917-08-22T22 Me e +27.30
1917-08-27T01 Lu d −24.76
1917-08-28T12 Lu xa +279.26
1917-08-30T13
** 
S +159.38
1917-09-01T07 Lu p 0.002386
1917-09-01T11 Lu v +337.96
1917-09-01T12 Lu o +338.47
1917-09-05T17 Me Rg +184.07
1917-09-07T02 Me d −5.37
1917-09-08T14 Lu +d +24.67
1917-09-10T01 Ve xa +202.29
1917-09-10T04 Lu xd +98.36
1917-09-12T11
** 
B +119.74
1917-09-13T18 Lu V +141.54
1917-09-14T15 Lu a 0.002717
1917-09-16T10 Lu c +172.97
1917-09-16T13 Me p 0.6419
1917-09-18T07 Me V +176.17
1917-09-18T23 Me c +175.45
1917-09-23T08 Lu d −24.51
1917-09-24T16 Lu xa +276.61
1917-09-27T05
** 
S +167.68
1917-09-28T02 Me Pg +169.49
1917-09-28T07 Ju +d +21.28
1917-09-28T15 Me xd +169.53
1917-09-29T17 Lu p 0.002399
1917-09-29T21 Lu v +352.53
1917-09-30T15 Ju Rg +71.52
1917-09-30T20 Lu o +59.12
1917-10-01T09 Me +d +4.48
1917-10-04T12 Me e −17.87
1917-10-05T22 Lu +d +24.41
1917-10-06T04 Pl Rg +95.53
1917-10-07T05 Lu xd +95.40
1917-10-09T04
** 
B +130.48
1917-10-11T08 Lu V +145.09
1917-10-12T01 Lu a 0.002712
1917-10-16T02 Lu c +202.17
1917-10-20T13 Lu d −24.28
1917-10-20T16 Me v +197.24
1917-10-21T16 Lu xa +273.68
1917-10-25T11
** 
S +197.97
1917-10-27T22 Lu p 0.002430
1917-10-28T02 Lu v +4.68
1917-10-28T07 Ur d −15.58
1917-10-30T06 Lu o +36.26
1917-10-30T07 Ur Pg +319.79
1917-11-02T07 Lu +d +24.22
1917-11-03T09 Lu xd +92.75
1917-11-03T11 Me o +220.35
1917-11-05T18
** 
B +158.89
1917-11-05T23 Me xa +224.36
1917-11-08T07 Lu V +152.88
1917-11-08T17 Lu a 0.002706
1917-11-08T23 Me a 1.445
1917-11-09T03 Pl d +18.75
1917-11-09T04 Ve d −26.40
1917-11-09T05 Ne d +18.33
1917-11-09T19 Ne Rg +127.11
1917-11-14T18 Lu c +231.83
1917-11-16T18 Lu d −24.15
1917-11-17T19 Lu xa +271.86
1917-11-21T03 Sa d +17.14
1917-11-21T07
** 
S +252.30
1917-11-24T05 Lu p 0.002466
1917-11-24T12 Lu v +6.17
1917-11-26T03 Sa Rg +134.54
1917-11-27T18 Ju p 4.059
1917-11-28T18 Lu o +65.99
1917-11-28T22 Ju V +66.47
1917-11-29T05 Ju o +66.43
1917-11-29T16 Lu +d +24.13
1917-11-30T13 Ve e +47.24
1917-11-30T16 Lu xd +91.54
1917-12-02T12
** 
B +186.33
1917-12-06T03 Me d −25.79
1917-12-06T10 Lu V +162.23
1917-12-06T14 Lu a 0.002703
1917-12-14T02 Lu d −24.14
1917-12-14T09 Lu c +261.83
1917-12-15T02 Lu xa +271.49
1917-12-15T23
** 
S +307.14
1917-12-17T09 Me e +20.26
1917-12-18T23 Lu p 0.002467
1917-12-19T01 Lu v +327.31
1917-12-25T04 Me Rg +289.70
1917-12-25T14 Me xd +289.67
1917-12-26T11 Pl c +94.49
1917-12-26T18 Pl V +94.48
1917-12-27T00 Lu +d +24.14
1917-12-27T09
** 
s +295.60
1917-12-28T01 Lu xd +91.53
1917-12-28T03
** 
B +190.41
1917-12-28T09 Lu o +96.11
1917-12-28T10 Pl p 42.96
1918-01-01T05 Ve xd +322.06



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