Tinh Menh Do

Solar Noon and Local True Solar Time

This tool calculates solar noon and true solar time for a specific geographic coordinate.

Select date, time, and map location to view UTC, civil time, true solar time, and local solar noon.

True Solar Time converter and New Moon calculator - Online version.

1. Select Date & Time

2. Select Location

Solar noon notes:

  • UTC: International time independent from local time zones.
  • Civil time: The clock time used by the selected location.
  • True solar time: Time based on the Sun’s actual apparent position.
  • Solar noon: The moment the Sun reaches its highest local altitude.

What is the new moon moment?

The new moon moment is the exact time when the Sun, Moon, and Earth align, with the Moon between the Sun and Earth.

At this moment the dark side of the Moon faces Earth, so the Moon is usually not visible.

Role in the lunar calendar

First lunar day rule

The local day containing the new moon moment is counted as day 1 of that lunar month.

Month length

The interval between two new moons is about 29.53 days, producing 30-day full months or 29-day short months.

Local calendar offset

Because the new moon is an absolute UTC moment, converting it to local time zones can produce different dates:

Country Time zone Result (example: new moon at 23:30)
Vietnam UTC+7 Day 1 is Dec 31
China UTC+8 Day 1 is Jan 1 (next day)

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