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True Solar Time Calculator

True Solar Time Calculator

Choose birth city, then date and time. Your true solar time appears below the button.

Learn How True Solar Time Is Calculated

What is True Solar Time?

True solar time is the sun’s position relative to your local meridian. When the sun crosses that meridian, that is true noon. It differs from standard clock time: place changes the result through longitude (the gap from the time-zone meridian), and the date changes it through the equation of time. The conversion uses longitude and the clock zone on the birth date. Latitude does not change the result.

Why True Solar Time Matters in Destiny Reading

True solar time follows the sun’s actual position. Mean solar time assumes the sun moves evenly, which is what clocks use. The gap is the equation of time, caused by Earth’s elliptical orbit and axial tilt, not by the Earth spinning faster or slower. In short: true solar time = mean solar time + equation of time. The calculation converts the birth-certificate clock time to UTC with that date’s time zone—including historical offsets, such as UTC+7:30 in Peninsular Malaysia and Singapore before 1 January 1982—then adds the longitude offset and the equation of time.

Quick Start

Follow the 4 steps below. Once the calculation is complete, the page will automatically scroll to the result.

1

Your Birthplace

Can’t find your birth city? Look up its latitude and longitude and enter them manually.

2

City Latitude and Longitude

If you cannot find the birth city, you can enter the birth coordinates manually.

3

Your Birthday

Enter the Gregorian date on the birth record. If the true solar time falls in 23:00–23:59, use the next date for the day pillar and keep the hour and minute. It is not rewritten as 00:00.

4

Birth Hour and Minute

Enter the clock time on the birth record (24-hour). Do not convert it to true solar time yourself first. It is turned into UTC with that date’s time zone, then adjusted by longitude and the equation of time.

Choose the time zone on the birth record. Daylight saving and standard-time changes follow that zone’s history. Before 1 January 1982, Peninsular Malaysia and Singapore were UTC+7:30; Sabah and Sarawak were UTC+8. Cities in China, including the west, default to Beijing time. If the birth-date zone differs from today, the result says so.

Fill in the birthplace, birth date, and birth time to start the calculation.