Methanespirit
August 21st, 2001, 08:18 AM
#1 Determining the correct time.
In order for any Astrologer to calculate a correct (natal) chart, it must be first be dermined what is the accurate Greenwich Time of the event. Greenwich time is the world time standard at Greenwich, England, also, of which most all Astrological ephererides (the daily planetary guide) are set to. Most countries have time zones within their borders. A time zone is an area, usually located straddling a meridian of a fixed amount of hours from Greenwich time. (GMT, Greenwich Mean Time, or using modern vernacular, Universal Time, UT). For example, the west coast of the US is on a time zone of 8 hours behind (west) UT. India (the entire country) is on a time zone that is 5 -1/2 hours ahead (east) of UT (because of the rotation of the earth, India receives the new day before England). Many time zones have names: as in our examples, that of the Pacific coast of the USA is called Pacific Standard Time (PST) , while that of India is called Indian Standard Time (IST.) To determine the accurate UT of an event simply add or subtract the amount of hours the time zone, of which the event occured is different from UT. If an event occured at say, 2 PM, clock time, PST, you must add 8 hours to that time in order to determine what the UT is. This gives a correct UT of 10 PM. While in India, 2 PM must be subtracted from because they are ahead of UT by 5-1/2 hours which would yield a UT of 8:30 AM.
All Astrological time it is to be stated in terms of a 24-hour clock. That is, 0 to 24 hours for the entire day, thereby , eliminating the need for an AM or PM referencing. If an event occured at 2PM clock time, simply add 2 hours to 12 noon (because 2 PM is two hours after noon) making it 14:00. hours. In working with any Astrological empemerides, and for other significant reasons, such as working with the Sidereal Time (or also known as the Mean Sun) , always work within a 24-hour day for time refrencing. This is very important when learning to calculate any progressed chart.
In cases where Daylight savings time is given ,you must SUBTRACT ONE HOUR from the DST, to determine what is the Standard clock time, and then proceed to determining what is the UT. It is always important to list, when giving a time for Astrological purposes, which time zone is used , and whether it is daylinght time (DST) or standard time (ST). Our example time should therefore be listed as 14:00 PST or PDST, whatever the case may be, and for India 14:00 IST.
Most all modern world maps have the several time zones given in them and how many hours they are different from UT.
In order for any Astrologer to calculate a correct (natal) chart, it must be first be dermined what is the accurate Greenwich Time of the event. Greenwich time is the world time standard at Greenwich, England, also, of which most all Astrological ephererides (the daily planetary guide) are set to. Most countries have time zones within their borders. A time zone is an area, usually located straddling a meridian of a fixed amount of hours from Greenwich time. (GMT, Greenwich Mean Time, or using modern vernacular, Universal Time, UT). For example, the west coast of the US is on a time zone of 8 hours behind (west) UT. India (the entire country) is on a time zone that is 5 -1/2 hours ahead (east) of UT (because of the rotation of the earth, India receives the new day before England). Many time zones have names: as in our examples, that of the Pacific coast of the USA is called Pacific Standard Time (PST) , while that of India is called Indian Standard Time (IST.) To determine the accurate UT of an event simply add or subtract the amount of hours the time zone, of which the event occured is different from UT. If an event occured at say, 2 PM, clock time, PST, you must add 8 hours to that time in order to determine what the UT is. This gives a correct UT of 10 PM. While in India, 2 PM must be subtracted from because they are ahead of UT by 5-1/2 hours which would yield a UT of 8:30 AM.
All Astrological time it is to be stated in terms of a 24-hour clock. That is, 0 to 24 hours for the entire day, thereby , eliminating the need for an AM or PM referencing. If an event occured at 2PM clock time, simply add 2 hours to 12 noon (because 2 PM is two hours after noon) making it 14:00. hours. In working with any Astrological empemerides, and for other significant reasons, such as working with the Sidereal Time (or also known as the Mean Sun) , always work within a 24-hour day for time refrencing. This is very important when learning to calculate any progressed chart.
In cases where Daylight savings time is given ,you must SUBTRACT ONE HOUR from the DST, to determine what is the Standard clock time, and then proceed to determining what is the UT. It is always important to list, when giving a time for Astrological purposes, which time zone is used , and whether it is daylinght time (DST) or standard time (ST). Our example time should therefore be listed as 14:00 PST or PDST, whatever the case may be, and for India 14:00 IST.
Most all modern world maps have the several time zones given in them and how many hours they are different from UT.