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Free Solar Time Calculator Online

You can use the Solar Time calculator for free without registration. It shows the true Solar Time for the selected date and place, taking longitude and local time conditions into account.

With a free account, you can work with the Chinese calendar more precisely. The account version gives access to the exact start of the 24 Solar Terms. This is important for checking month boundaries in Bazi, choosing time and working with the Chinese solar calendar.

This calculation is especially useful when a date or time is close to a seasonal transition. In such cases, even a small difference in time may affect the correct chart.

Why Solar Time matters in Feng Shui, Bazi and Qi Men

Solar Time is not just an astronomical abstraction. It is the time of a place based on the actual position of the Sun. Before modern clock time, people measured time by the movement of the Sun and the shadow it cast. Local noon meant the Sun’s position above that place, not the number shown by an administrative clock.

Chinese metaphysics — including Bazi, Feng Shui and Qi Men — works with time as part of local Qi. That is why Solar Time can matter when calculating a chart, choosing a moment or checking the boundary of a Chinese two-hour period.

The day was traditionally divided into 12 two-hour periods. Each period is connected with the movement of time through the day. In modern use, these periods are often shown as fixed clock ranges, such as 11:00–13:00 or 13:00–15:00, but the underlying idea is connected with the local movement of the Sun.

Modern civil time can shift for many reasons: time zones, daylight saving time, administrative borders or political decisions. The clock may move forward or backward, but the Sun does not change its course because of that.

For example, two nearby places can have different clock times because they are in different time zones, while the local solar situation changes smoothly. The same can happen when crossing a border by car: the clock may change immediately, but the Sun has not suddenly moved by one hour.

This is why, when working with local Qi, this calculator uses the date, place, longitude and time zone to show timing relative to the local Sun.

Some Feng Shui and Chinese metaphysics schools use Beijing time as it is. Solar Time is used when the calculation needs to follow the local Qi of a specific place. The important point is not to mix the two approaches without understanding which time mode is being used.

Without registration, you can quickly check Solar Time for the selected place. After free registration, the account version also shows the exact start of the 24 Solar Terms.

This helps when working with month boundaries, seasonal transitions and calculations where not only the date, but also the exact moment of a Solar Term change matters.