Astronomy Answers
Planetary Phenomena 2018


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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

[2018] [Q 2018]

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
2018−01−01T17
** 
S +139.22
2018−01−01T18 Lu v +96.27
2018−01−01T21 Lu p 0.002384
2018−01−01T23 Lu +d +20.06
2018−01−02T01 Me e −22.58
2018−01−02T02 Lu o +101.65
2018−01−02T12 Ur Pg +24.57
2018−01−04T07 Lu xa +135.21
2018−01−09T12 Ve o +289.23
2018−01−09T12 Pl o +289.09
2018−01−09T13 Pl v +289.09
2018−01−11T01 Ve a 1.711
2018−01−11T16 Pl a 34.46
2018−01−15T02 Me xa +275.33
2018−01−15T02 Lu a 0.002717
2018−01−15T04 Lu V +274.15
2018−01−15T16 Lu d −20.05
2018−01−16T13
** 
B +92.32
2018−01−17T02 Lu c +296.90
2018−01−18T14 Lu xd +314.90
2018−01−18T23 Me d −23.48
2018−01−29T11 Lu +d +20.02
2018−01−30T08 Lu v +113.50
2018−01−30T09 Lu p 0.002400
2018−01−30T11
** 
S +132.98
2018−01−31T13 Lu o +131.63
2018−01−31T18 Lu xa +134.91
2018−02−09T17 Me a 1.403
2018−02−11T12 Lu V +275.07
2018−02−11T14 Lu a 0.002712
2018−02−11T23 Lu d −20.03
2018−02−13T15
** 
B +92.04
2018−02−14T21 Lu xd +315.01
2018−02−15T21 Lu c +327.14
2018−02−17T11 Me o +328.77
2018−02−25T20 Lu +d +20.06
2018−02−26T13 Me v +345.68
2018−02−27T14 Lu p 0.002433
2018−02−27T17 Lu v +127.89
2018−02−28T05 Lu xa +134.86
2018−02−28T08
** 
S +140.21
2018−03−02T00 Lu o +161.37
2018−03−04T13 Ne c +343.94
2018−03−04T17 Ne v +343.95
2018−03−05T09 Ne a 30.94
2018−03−05T18 Me xd +359.08
2018−03−05T23 Ju d −17.42
2018−03−09T04 Ju Rg +233.23
2018−03−11T06 Lu d −20.11
2018−03−11T09 Lu a 0.002705
2018−03−11T09 Lu V +281.81
2018−03−13T19
** 
B +105.83
2018−03−14T03 Lu xd +314.50
2018−03−15T10 Me e +18.27
2018−03−16T18 Ma xa +269.49
2018−03−17T13 Lu c +160.01
2018−03−23T00 Me Rg +16.91
2018−03−24T02 Me +d +9.73
2018−03−25T02 Lu +d +20.21
2018−03−26T16 Lu p 0.002467
2018−03−27T00 Lu v +127.36
2018−03−27T10 Lu xa +133.74
2018−03−27T14 Ma d −23.55
2018−03−28T04
** 
S +153.61
2018−03−31T12 Lu o +190.74
2018−04−01T17 Me c +11.95
2018−04−02T14 Me V +11.23
2018−04−04T08 Pl +d −21.45
2018−04−05T04 Me p 0.5877
2018−04−07T14 Lu d −20.32
2018−04−08T05 Lu a 0.002702
2018−04−08T09 Lu V +289.48
2018−04−10T08 Lu xd +312.58
2018−04−10T22
** 
B +112.29
2018−04−12T03 Ve xd +44.68
2018−04−13T01 Me xa +5.02
2018−04−15T09 Me Pg +4.78
2018−04−16T01 Lu c +26.06
2018−04−18T00 Sa Rg +279.15
2018−04−18T07 Ur v +28.48
2018−04−18T14 Ur c +28.50
2018−04−19T04 Ur a 20.90
2018−04−19T11 Sa +d −22.24
2018−04−19T19 Lu v +78.89
2018−04−20T12 Me d +0.81
2018−04−20T15 Lu p 0.002465
2018−04−21T07 Lu +d +20.44
2018−04−22T10 Pl Rg +291.30
2018−04−23T12 Lu xa +131.25
2018−04−24T23
** 
S +162.75
2018−04−29T15 Me e −26.88
2018−04−30T00 Lu o +219.68
2018−05−04T23 Lu d −20.56
2018−05−06T00 Lu a 0.002704
2018−05−06T07 Lu V +296.64
2018−05−07T10 Lu xd +309.67
2018−05−07T22
** 
B +127.95
2018−05−09T00 Ju o +228.36
2018−05−09T12 Ju V +228.29
2018−05−10T11 Ju p 4.400
2018−05−15T11 Lu c +54.59
2018−05−17T11 Lu v +83.60
2018−05−17T21 Lu p 0.002432
2018−05−18T15 Lu +d +20.65
2018−05−20T13 Lu xa +128.42
2018−05−22T05 Ve +d +25.06
2018−05−22T19
** 
S +192.00
2018−05−29T14 Lu o +248.16
2018−06−01T07 Lu d −20.73
2018−06−01T18 Me xd +65.90
2018−06−02T16 Lu a 0.002709
2018−06−03T02 Lu V +302.41
2018−06−03T12 Lu xd +307.15
2018−06−03T19
** 
B +156.98
2018−06−04T16 Ma +d −21.70
2018−06−05T19
** 
s +235.51
2018−06−05T21 Me a 1.322
2018−06−06T07 Me v +75.84
2018−06−06T12 Me o +76.28
2018−06−13T19 Lu c +82.73
2018−06−14T18 Lu v +96.69
2018−06−14T22 Me +d +25.15
2018−06−15T00 Lu p 0.002403
2018−06−15T00 Lu +d +20.76
2018−06−15T19 Ne +d −6.21
2018−06−16T17 Lu xa +126.44
2018−06−17T18
** 
S +242.31
2018−06−18T19 Ne Rg +346.50
2018−06−26T20 Ma Rg +309.22
2018−06−27T12 Sa V +275.86
2018−06−27T13 Sa o +275.86
2018−06−27T17 Sa p 9.049
2018−06−28T04 Lu o +276.46
2018−06−28T14 Lu d −20.77
2018−06−30T02 Lu a 0.002714
2018−06−30T08
** 
B +174.49
2018−06−30T12 Lu V +303.86
2018−06−30T16 Lu xd +305.98
2018−07−06T02 Ju +d −14.82
2018−07−10T01 Me xa +134.06
2018−07−10T02 Pl p 32.57
2018−07−10T16 Ju Pg +223.35
2018−07−12T03 Me e +26.41
2018−07−12T08 Pl V +290.03
2018−07−12T11 Lu +d +20.76
2018−07−12T12 Pl c +290.03
2018−07−12T13
** 
S +238.00
2018−07−13T02 Lu c +110.70
2018−07−13T06 Lu v +112.83
2018−07−13T08 Lu p 0.002389
2018−07−14T02 Lu xa +125.92
2018−07−25T20 Lu d −20.75
2018−07−26T04 Me Rg +143.46
2018−07−26T05
** 
B +160.99
2018−07−27T05 Ma o +304.15
2018−07−27T05 Lu a 0.002715
2018−07−27T06 Lu V +297.89
2018−07−27T20 Lu o +304.75
2018−07−27T22 Lu xd +305.91
2018−07−28T08 Ma V +303.84
2018−07−31T07 Ma p 0.3850
2018−07−31T10 Me d +9.85
2018−08−01T16 Ve xa +174.54
2018−08−05T18 Me p 0.5964
2018−08−06T09 Ur +d +11.85
2018−08−07T13 Ur Rg +32.56
2018−08−08T05 Me V +137.14
2018−08−08T12
** 
S +213.59
2018−08−08T22 Lu +d +20.76
2018−08−09T01 Me c +136.47
2018−08−10T13 Lu xa +125.92
2018−08−10T18 Lu p 0.002394
2018−08−10T19 Lu v +129.64
2018−08−11T09 Lu c +138.73
2018−08−16T11 Ma d −26.50
2018−08−17T07 Ve e +45.91
2018−08−19T04 Me Pg +131.53
2018−08−22T02 Lu d −20.77
2018−08−22T12
** 
B +150.91
2018−08−23T05 Lu V +294.22
2018−08−23T11 Lu a 0.002712
2018−08−24T04 Lu xd +305.88
2018−08−26T06 Me +d +15.82
2018−08−26T11 Lu o +333.21
2018−08−26T21 Me e −18.31
2018−08−27T13 Ma Pg +298.61
2018−08−28T17 Me xd +137.26
2018−09−04T10
** 
S +192.26
2018−09−05T06 Lu +d +20.83
2018−09−06T09 Sa Pg +272.55
2018−09−06T22 Lu xa +125.40
2018−09−06T23 Ne p 28.93
2018−09−07T18 Ne o +345.08
2018−09−07T20 Ne V +345.08
2018−09−08T01 Lu p 0.002415
2018−09−08T07 Lu v +145.67
2018−09−09T18 Lu c +167.03
2018−09−12T23 Me v +162.84
2018−09−18T09 Lu d −20.91
2018−09−19T01
** 
B +129.27
2018−09−19T19 Lu V +297.68
2018−09−20T01 Lu a 0.002706
2018−09−20T09 Lu xd +304.78
2018−09−21T12 Me o +178.83
2018−09−25T02 Lu o +2.03
2018−09−28T15 Me a 1.407
2018−09−30T22 Pl Pg +288.77
2018−10−01T19
** 
S +163.29
2018−10−02T13 Lu +d +21.04
2018−10−04T03 Lu xa +123.56
2018−10−05T18 Ve Rg +220.84
2018−10−05T21 Lu p 0.002449
2018−10−06T00 Me xa +203.67
2018−10−06T11 Lu v +157.19
2018−10−08T19 Ve d −22.00
2018−10−09T03 Lu c +195.82
2018−10−15T17 Lu d −21.15
2018−10−16T01
** 
B +112.18
2018−10−17T12 Lu xd +302.21
2018−10−17T16 Lu V +304.29
2018−10−17T19 Lu a 0.002702
2018−10−18T15
** 
b +74.25
2018−10−20T20 Sa d −22.77
2018−10−23T04 Pl d −22.10
2018−10−23T11 Ur p 18.88
2018−10−23T17 Pl xd +288.90
2018−10−23T22 Ur V +30.56
2018−10−24T00 Ur o +30.56
2018−10−24T16 Lu o +31.21
2018−10−26T14 Ve c +213.11
2018−10−26T17 Ve V +213.03
2018−10−27T11 Ve p 0.2721
2018−10−29T18 Lu +d +21.29
2018−10−29T21
** 
S +152.68
2018−10−31T03 Lu xa +120.62
2018−10−31T20 Lu p 0.002475
2018−11−01T13 Lu v +140.54
2018−11−06T14 Me e +23.15
2018−11−07T16 Lu c +225.21
2018−11−12T02 Lu d −21.40
2018−11−12T13 Me d −24.82
2018−11−12T14
** 
B +109.00
2018−11−13T14 Lu xd +299.16
2018−11−14T15 Lu a 0.002703
2018−11−14T16 Lu V +311.94
2018−11−16T10 Ve Pg +205.25
2018−11−17T01 Me Rg +253.50
2018−11−22T20 Ve xd +206.04
2018−11−23T05 Lu o +60.88
2018−11−23T05 Ne d −7.32
2018−11−24T03 Ju a 6.347
2018−11−24T16 Me xd +248.62
2018−11−24T22 Ne Pg +343.70
2018−11−26T00 Lu v +100.95
2018−11−26T01 Lu +d +21.48
2018−11−26T06 Ju c +243.95
2018−11−26T12 Lu p 0.002451
2018−11−26T18
** 
S +154.32
2018−11−26T23 Me p 0.6780
2018−11−27T05 Lu xa +118.06
2018−11−27T06 Me V +245.22
2018−11−27T09 Me c +245.07
2018−11−28T03 Ve +d −9.82
2018−11−28T09 Ju v +244.43
2018−12−06T21 Me Pg +237.28
2018−12−07T07 Lu c +255.14
2018−12−07T08 Me +d −16.91
2018−12−09T07
** 
s +91.66
2018−12−09T11 Lu d −21.54
2018−12−10T12
** 
B +111.86
2018−12−10T17 Lu xd +297.19
2018−12−12T12 Lu a 0.002708
2018−12−12T15 Lu V +319.46
2018−12−15T15 Me e −21.15
2018−12−22T17 Lu o +90.85
2018−12−23T11 Lu +d +21.54
2018−12−24T01
** 
S +148.84
2018−12−24T06 Lu v +113.43
2018−12−24T09 Lu p 0.002414
2018−12−24T11 Lu xa +116.86



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Last updated: 2016−02−07