US Birth Times, Time Zones and Your Vedic Chart
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The three pieces to keep together
Keep the birth date, recorded local clock time and actual birthplace together. If any one changes, the UTC moment or local sky may change. A birth in New York is not calculated using the time zone of the place you live now.
Be especially careful with midnight and noon: 12:00 a.m. begins a date and 12:00 p.m. is noon. Also check US month/day/year notation when copying a record into a date field.
Daylight saving is tied to a date and location
Most US locations change clocks seasonally, but exceptions and historical changes matter. A fixed instruction to subtract five hours for every Eastern-time birth will be wrong for many dates. The applicable offset must come from the birthplace’s historical time-zone rules.
NIST documents changes to US daylight-saving rules, including the 2007 change. Do not apply today’s changeover dates to every historical birth.
The repeated hour needs extra information
When clocks move back, some local times occur twice. A birth record stating only the repeated clock time may not identify the UTC instant. Look for an offset or standard/daylight designation, or ask the record issuer whether that detail is available.
When clocks move forward, some clock times do not occur. If a recorded time lands in that gap, check the record rather than assuming the calculator corrected it. A precisely displayed chart is not proof that an ambiguous input was resolved correctly.
When two calculators still disagree
After matching date, time and location, match the zodiac and ayanamsha. A tropical chart and a Lahiri sidereal chart should not have identical sign degrees. Then match the house system before comparing house numbers.
Use the Vedic versus Western comparison to separate these settings. For a Navamsa calculation, use exact sidereal degrees; a rounded ascendant can cross a D9 boundary.
Frequently asked questions
Should I use my current time zone for my birth chart?
No. Use the local time and time zone at the original birthplace on the birth date.
Can daylight saving change a chart?
An incorrect one-hour offset changes the UTC moment supplied to the chart calculation. That can change the ascendant and other time-sensitive results.
Does selecting a birth city resolve every ambiguous time?
No. A clock time repeated when daylight saving ends can refer to two moments even in the same city. Additional information about the recorded offset may be needed.
Sources
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