Natal Chart x DST x for the Astrology Inclined:

Joe was born on October 8th 1993.
Schmo was also born on October 8th 1993.
Joe was born at 10:08pm from New York, New York
And Shmo, born at 10:08pm in Honolulu, Hawaii.

Everyone thought both Joe & Schmo had a unique bond; two different humans born at the same time on the same day.
Except that’s wrong:

In the United States from early March to early November, the majority of the country moves on over to DST, an extra hour of daylight.
Hawaii is one of the few states that does not participate in it.

Anyways,
Once we, as in the entire country, head back on over to November, that’s when we’re all reunited to the beat of regular time.

This is applicable for the UK and other nations, too.

So because Joe was born in New York, and since NY’s October timing is DST based, he’s really born at 21:08.
But Schmo though, Schmo is a real one; he’s still born at 22:08

BUT
But but but
Say Joe was born on October 8th, but a different year, say 1858- if the given documented time was 10:08pm, then it’s the legit 22:08, since DST wasn’t a thing back then, let alone in New York.
So factors to look out for are: the era, and your state’s and or region’s based off timing.

I think it’s important because you want to make sure you put in the correct details for your natal chart, timing especially.

So. With that in mind. If Joe from New York were to go get his natal chart done he would say 10:08DST or 9:08pm EST or 21:08 universal time

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Chances are y’all already knew this
But your fav color over here has literally been giving astrologers the wrong time for like the past two decades lol
I’m still not over it!!

Anyone know if Co-Star AI automatically takes this in account? Can’t tell if I should go back an hour when entering my time of birth

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Yes, that’s why the first thing a good astrologer does, when casting your chart, is to convert the time to UT (Universal Time, which is free of man-made artifacts). This is also why the reputable ephemerides (the tables of that model the movements of the planets) are published in UT.

You also want to use exact longitude and latitude, not just a generic “Phoenix, AZ” (which is a very big place). Precise longitude and latitude can make a big difference, too.

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That’s so cool
Maybe this is why astrologers were always off with my reports
Do you know of any internet sites I can purchase from that’ll take all this into consideration?

Yeah, that doesn’t work out too well.

Although a good astrologer wants to be verifying their (or their software’s) calculations by asking a new client about past events and doing a mini-rectification of their calculations before diving into their analysis and predictions.

Maybe things have gotten–erm–sloppier (?) now that only the die-hards calculate charts by hand (which requires math in base60 and a firm grasp of trigonometry and derivatives). :man_shrugging:

Probably the time threw them off the most. A 4 minute difference in the time of birth changes the Ascendant 1 degree. The Ascendant is one of the basis for where the houses are drawn.

Verify your time of birth (which, actually, will be an estimate because, even in modern times, the doctors and nurses have other things to do than note the exact time of any birth).

All the legit sites have fields for both longitude and latitude, which you can get off of any mapping site like Bing, AppleMaps or GoogleMaps.