Matrix Software became the very first company to successfully program a microcomputer to calculate astrological birth charts back in 1977, completely revolutionizing the industry.

Turning a Birth Time Into a Chart

An astrological birth chart is built from a particular moment and place. To calculate one, an astrologer must determine where the planets appeared in the sky at that time, then relate those positions to the local horizon and the chart’s divisions, called houses. That means combining astronomical tables, time conversions, geographic coordinates, and geometry—not simply looking up a person’s birthday.

Before computerized tools, much of that work was done by hand. Almanacs supplied planetary positions for set times; astrologers then adjusted those figures and used arithmetic and trigonometry to derive the chart. Each step offered room for calculation errors, especially when many charts had to be prepared.

What the Software Changed

Matrix Software’s 1977 program put those repeatable calculations on a microcomputer. Entering birth details could produce the chart’s calculated positions and layout far faster than working through tables and equations manually. The important change was not that a computer discovered a new kind of astrology, but that it made chart construction more efficient and consistent.

That distinction matters: software can calculate and display a chart, while interpreting what its symbols mean remains a separate task. By taking much of the arithmetic out of the process, early astrology programs helped make prepared charts easier to produce—and made computing a practical tool in an activity previously tied to paper tables and hand calculation.