There may be discrepancies as with all historical time zone atlases, particularly for birth years before 1970, so if you need help with the time zone offset value, send an email to Be sure to mention why you’re writing and include full birth data.

Please don’t adjust the time zone offset unless you know for certain what you’re doing since the default offsets incorporate crucial factors, such as daylight savings time, and are in the majority of cases accurate.

** Important: Under normal circumstances, you don’t need to change the time zone offset.

For example, if you were born in Fuzhou, Fujian, China, you should enter “fuzhou” or similar and not “fujian” or “china.” It’s better not to overtype – for best results, type in the CITY name and scroll through the list for the correct city.

It’s important to enter the city name only or the first several letters of the city in the Birth City field, not the country or state/province/region.

In this case, you can use this same tool on my sister site, Astrology Cafe here. If you’re just not getting results and can’t submit, it may be that the atlas is busy (GeoNames has certain limits per hour and per day).

Please be patient when entering your birth city to allow the program to call up the list of locations as sometimes it’s not instantaneous.

Some notes about this birth chart calculator: More to come, so please check back from time to time! **See instructions/notes below for using this calculator. Many of the major factors are currently interpreted, such as Sun, Moon, Ascendant, Mercury, and Venus in signs and house. After studying astrology and experimenting with house systems, you might elect to use Whole Sign, Koch, Campanus, Equal, or others, or continue with Placidus. If you're uncertain, we suggest using the default generator with Placidus houses to start. For example, if the Ascendant is 4 degrees Leo, then the 1st house begins at 0 degrees Leo, the 2nd house is calculated as 0 degrees Virgo, the 3rd, 0 degrees Libra, and so forth. The whole sign house system With the Whole Signs House system, each house begins at 0 degrees of the sign. This system is not for everyone so that if you are uncertain, you might instead go back to the default system for determining houses, which is Placidus ( For the default house system, Placidus, return here). The following free birth chart tool lists planet signs, house positions, and aspects. Free Natal Chart Report – Whole Sign Houses

Natal chart degrees