Casting a chart using a NY at 12 noon ephereris...

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I'm trying to calculate the planetary positions only, not the house

positions.

 

Is the following methodology sound? What other calcs would I need to

include?

 

Thanks to Phyll Chubb for getting me started

 

>One way of casting a chart is to use Greenwich Mean

>Time (GMT) as a standard reference point. This allows

>us to cast charts for anywhere in the world once we

>can plot where the planets are located, based on the

>equivalent of the local time to GMT.

>

>The first information we require will be the latitude

>(degrees north or south of the equator)and longitude

>(degrees east or west of Grennwich) of your place of

>birth, followed by the local time of your birth.

>

>There is a formula which will convert the longitude

>into degrees and minutes of space. The formula is: One

>degree of space is equivalent to four (4)

> minutes of time. As an example: If your birth place

>was 120 degrees west of Greenwich you would multiply

>120 degrees of space X 4 minutes of time to get

> an answer of 480. Now we must convert the 480

>minutes of space into time. This is done by dividing

>60 (there are 60 minutes in one hour) into 480.

>

>Once this is done we get the answer of 8 hours.

>Therefore we can say this imaginary place of birth

>will be 8 hours behind GMT since we are going west.

>

>If, we were looking for the distance between GMT and

>120 degrees east of GMT we would be able to say the

>time at the place of birth would be 8 hours

> ahead of GMT.

>

>We're using New York at noon as our standard. We

>have to determine how far ahead or behind they are in

>time by calculating the difference between their birth

>longitude and NY. Then adding or subtracting the

>amount of time to aquire the ephemeris data for that

>time.

>

>Then we prorate the planets positions based on the

>direction they are moving, and how fast they move in

>the 24 hours when the adjusted time falls.

>

>If the subject was born at an adjusted time of 2pm -

>then we'd assume that the planets had moved 2/24ths (2

>hours forward towards a total of 24 hours) of the way

>towards their position at 12 noon the next day.

>