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11. TIME ZONES AND CHANGES
When erecting a horoscope it is always necessary to first ascertain the time zone. In addition, it is necessary to determine whether standard, daylight savings, war, or double summer time was used. It is for that reason that the following tables will be useful when calculating correct times and zones.
Standard Time Zones of the World Meridian Correction Standard Time Zone 0 Add 0 hours to time Greenwich Mean Time +15 Add 1 hour to time West Africa Time +30 Add 2 hours to time Azores Time +45 Add 3 hours to time Brazil Standard time +52.5 Add 3.5 hours to time Newfoundland Time +60 Add 4 hours to time Atlantic Standard Time +75 Add 5 hours to time Eastern Standard Time +90 Add 6 hours to time Central Standard Time +105 Add 7 hours to time Mountain Standard Time +120 Add 8 hours to time Pacific Standard Time +135 Add 9 hours to time Yukon Standard Time +150 Add 10 hours to time Central Alaska Time +157.5 Add 10.5 hours to time Hawaiian Standard Time +165 Add 11 hours to time Ome Time/Bearing Time +180 Add 12 hours to time International Date Line West -180 Subtract 12 hours from time International Date Line East -165 Subtract 11 hours from time Not named -150 Subtract 10 hours from time Guam Standard Time -142.5 Subtract 9.5 hours from time South Australia Standard Time 135 Subtract 9 hours from time Japanese Standard Time -127.5 Subtract 8.5 hours from time Moluccas Time -120 Subtract 8 hours from time China Cost Time -112.5 Subtract 7.5 hours from time Java Time -105 Subtract 7 hours from time South Sumatra Time -97.5 Subtract 6.5 hours from time North Sumatra Time -90 Subtract 6 hours from time USSR Zone 5 -82.5 Subtract 5.5 hours from time Indian Standard Time -75 Subtract 5 hours from time USSR Zone 4 -60 Subtract 4 hours from time USSR Zone 3 -45 Subtract 3 hours from time Baghdad Time -30 Subtract 2 hours from time Eastern European Time -15 Subtract 1 hour from time Central European Time
TIME CHANGES IN THE UK
Year Daylight Savings Time Year Daylight Savings Time 1950 16.4 to 22.10 1985 31.3 to 27.10 /1951 15.4 to 21.10 1986 30.3 26.10 1952 20.4 to 26.10 1987 29.3 to 25.10 1953 19.4 to 4.10 1988 27.3 to 23.10 1954 11.4 to 3.10 1989 26.3 to 29.10 1955 17.4 to 2.10 1990 25.3 to 28.10 1956 22.4 to 7.10 1991 31.3 to 27.10 1957 14.4 to 6.10 1992 29.3 to 25.10 1958 20.4 to 5.10 1993 28.3 to 24.10 1959 19.4 to 4.10 1994 27.3 to 23.10 1960 10.4 to 2.10 1995 26.3 to 29.10 1961 26.3 to 29.10 1996 31.3 to 27.10 1962 25.3 to 28.10 1997 30.3 to 26.10 1963 31.3 to 27.10 1998 29.3 to 25.10 1964 22.3 to 25.10 1999 28.3 to 31.10 1965 21.3 to 24.10 2000 26.3 to 28.10 1966 20.3 to 23.10 2001 25.3 to 28.10 1967 19.3 to 29.10 2002 31.3 to 27.10 1968 18.2 1968 to 31.10 1971 2003 30.3 to 26.10 1968 daylight 2004 28.3 to 31.10 1969 daylight 2005 27.3 to 30.10 1970 daylight 2006 26.3 to 20.10 1971 18.2 1968 to 31.10 1971 2007 25.3 to 28.10 1972 19.3 to 29.10 2008 30.3 to 26.10 1973 18.3 to 28.10 2009 29.3 to 25.10 1974 17.3 to 27.10 2010 28.3 to 31.10 1975 16.3 to 26.10 2011 27.3 to 30.10 1976 21.3 to 24.10 2012 25.3 to 28.10 1977 20.3 to 23.10 2013 31.3 to 27.10 1978 19.3 to 29.10 2014 30.3 to 26.10 1979 18.3 to 28.18 2015 29.10 to 25.10 1980 16.3 to 26.10 2016 27.3 to 30.10 1981 29.3 to 25.10 2017 26.3 to 29.10 1982 28.3 to 24.10 2018 25.3 to 28.10 1983 27.3 to 23.10 2019 31.3 to 27.10 1984 25.3 to 28.10
The times will change from year to year, but as a general rule, the times in the UK are scheduled to change to daylight savings time at 1.00am on the last Sunday in March and then go back to standard time at 2.00am on the last Sunday in October.
TIME CHANGES IN THE US
Year Daylight Savings Time Year Daylight Savings Time 1966 24.4 to 30.10 1991 28.10 to 27.10 1967 30.4 to 29.10 1992 26.4 to 25.10 1968 28.4 to 27.10 1993 25.4 to 31.10 1969 27.4 to 26.10 1994 24.4 to 30.10 1970 26.4 to 25.10 1995 30.4 to 29.10 1971 25.4 to 31.10 1996 28.4 to 27.10 1972 30.4 to 29.10 1997 27.4 to 26.10 1973 1.1 to 31.12 1998 26.4 to 25.10 1974 6.1 to 27.10 1999 25.4 to 31.10 1975 23.2 to 26.10 2000 30.4 to 29.10 1976 25.4 to 31.10 2001 29.4 to 28.10 1977 24.4 to 30.10 2002 7.4 to 27.10 1978 30.4 to 29.10 2003 6.4 to 26.10 1979 29.4 to 28.10 2004 4.4 to 31.10 1980 27.4 to 26.10 2005 3.4 to 30.10 1981 26.4 to 25.10 2006 2.4 to 29.10 1982 25.4 to 31.10 2007 11.3 to 4.11 1983 24.4 to 30.10 2008 9.3 to 2.11 1984 29.4 to 28.10 2009 8.3 to 1.11 1985 28.4 to 27.10 2010 14.3 to 7.11 1986 27.4 to 26.10 2011 13.3 to 6.11 1987 26.4 to 25.10 2012 11.3 to 4.11 1988 24.4 to 30.10 2013 10.3 to 3.11 1989 30.4 to 29.10 2014 9.3 to 2.11 1990 29.4 to 28.10 2015 8.3 to 1.11
