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NAT-6 Calculations

9 Class Meetings
Prerequisites: None. This course can be taken in any order or doubled up with any NAT course.

Course Description:

The ability to calculate a chart by hand, using the Ephemeris and Book of Tables, is both a vital skill for the working astrologer and an international certification requirement. This course is based on a widely accepted method which is simple, rewarding, and easy to understand. It is a “hands-on” class in which the birth data for up to ten subjects provides opportunity to practice the steps both during class and through homework assignments.

Notice to students: Your instructor will be in touch with you 48 hours before your class begins.


Class Meeting 1: Time, Motion & Coordinates

This class deepens one’s understanding of time, motion and coordinates in preparation for calculating the natal chart. Latitude, longitude, and time zone considerations are discussed.

Class Meeting 2: GMT & Exploring the Ephemeris

This class explains how to read the ephemeris and how to convert birth time to GMT (Greenwich Mean Time). Working with time units and decimals is also reviewed.

Class Meeting 3: Calculating LST

This class teaches the calculation of LST (Local Sidereal Time). Once the LST is obtained one can calculate the Constant Decimal, angles and house cusps.

Class Meeting 4: The Book of Tables and Calculating the Constant Decimal

In this class, one explores the Michelsen Book of Tables, is introduced to the Placidus House System, and learns to calculate the Constant Decimal.

Class Meeting 5: Calculating House Cusps

Using a 4-function calculator, and the Book of Tables, one learns how to calculate the Mid-heaven, Ascendant, house cusps, and Equatorial Ascendant.

Class Meeting 6: Calculating Sun, Moon, Planets, and Nodes

Learn to convert the birth GMT to a decimal representing the portion of the day that has elapsed. This decimal is utilized in calculating the positions of the Sun, Moon, planets, and True Node. Placement of these points in the appropriate houses can then follow.

Class Meeting 7: Calculating the Vertex and Chiron

This class covers how to calculate the Vertex and “monthly data only” points such as Chiron.

Class Meeting 8: Review

This meeting allows for a final review of chart calculation methodology prior to the distribution of the Final Exam.

Class Meeting 9: Final Exam

Required/Suggested Materials:

Required materials:


Suggested/supplemental materials:


Class Offerings and Registration:
This course has no class offerings currently taking registrations.

Please note: In addition to the tuition fee, each class registration is subject to a non-refundable $75.00 administrative fee ($27.00 administrative fee for Pocket Courses). Please also read our tuition refund policy.

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