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Welcome to Astro Precise Services

Home of the world’s most accurate chart!

At Astro Precise Services (APS), we aim to develop original products utilizing the gold standard JPL Horizons API access for our calculations to help astrologers interpret charts better. To achieve this, we employ a revolutionary mathematical formula for conversion of civil or wall-clock time to Universal Time (UT) and vice versa to determine the precise position of celestial objects and other points.  For an explanation, refer to our Natal Chart Calculations. We focus extensively on the aspects these objects and points make by utilizing more aspects (32 total) than any of the astrological programs that exist today (click here for Alphabetical List of Objects).  An example of one of our aspect grids can be seen below.

We believe the display of aspects between and among the objects to be one of the most effective ways to properly interpret the chart. Click here to learn more about Our Vision.

Some of the products and services that we offer are listed below:

• Natal Chart Calculations
• New & Full Moon Charts
• Custom Ephemeris
• Daily Ephemeris & Aspectarian
• Fixed Stars
• Galactic Chart Calculations
• Research Groups

For a full list of our products and services click here.

Note: Depending on the number of orders, JPL Horizons server maintenance, etc., we may need 1-3 business days to complete an order and email the file(s) to you at the email you provided at checkout. We will be as prompt as possible.

We do not provide an ‘Update List’ for our various products that enumerates fixed bugs, error messages and so forth.  Why?  Because there aren’t any.  All products are fully tested before releasing to our valued customers.

Prerequisite:  You will need to have Microsoft Excel installed on your computer in order to open our files. We cannot guarantee that using another spreadsheet program will provide exactly the same experience.  Also, please note that some of our products are best viewed on larger monitors (at least 15” or bigger).

Refund policy:  After you receive the file(s) from us in your email, the purchase is not refundable.  In case we have made a miscalculation, we will re-calculate free of charge.