Strengthen Your Fundamentals in Astronomy
This online course provides essential knowledge of fundamental astronomy to help students better understand the mechanics, motion, and terminology of our solar system. The course includes weekly classes, activities, and quizzes to help integrate the knowledge and develop a clearer sense of how it all works.
Astronomy for Astrologers is an OPA Foundation signature program and part of the OPA certification process.
Linea Van Horn & Geoff Gronlund
Begins October 4 2026
Live attendance is always recommended but not required. All weekly classes are recorded and shared with participants shortly after each class.
A portal with live discussions, quizzes, class recordings, weekly presentation slides, and other course material is available to all participants throughout the course.
The course is designed to prepare students to pass most astronomy certification exams, regardless of which organization sponsors it. However, it does not teach full chart calculation by hand. If you are looking at other certifications, please check their requirements.
2026 Class Schedule
8-week Course Held on Sundays
Oct 4 2026 thru Nov 22 2026
11 AM – 1 PM Pacific
2 PM – 4 PM Eastern
6 PM – 8 PM UTC
2026 Exam Schedule
December 6, 2026 at 2pm eastern
Topics Covered
- Great Circles and 3 Coordinate Systems
- The Solar Cycle
- The Moon: Phases, Nodes, and Eclipses
- Planets
- Declination
- Synodic Cycles
- The Two Zodiacs, Fixed Stars, and Precession
- House Systems
Advanced Pricing Registration
$360 members
$460 non-members
After Sept 20 2026
$435 members
$535 non-members
Members: Use this discount coupon code at checkout:
Member-Astronomy-2026
Not a member? Join OPA Here >
International non-member pricing – $295
(Use code International295AA at checkout)
International member pricing – $195
(Use International295AA and Member-Astronomy-2026 codes)
* includes Turkey, Greece, Mexico, Brazil, South Africa, and all of South and Central America
Public Program Exams
Sunday, December 6
11 AM PT | 2 PM ET | 7 PM UTC
For those who would like to take the OPA Astronomy for Astrologers exam, whether you have taken the course in the past or not, this is an opportunity to secure this requirement for OPA Certification. You will need to answer at least 70% of the questions on the exam correctly to pass.
If you have taken OPA’s Astronomy for Astrologers course before, either with Gemini Brett or with Linea Van Horn and Geoff Gronlund, you can participate in this exam at no charge*. If you have not taken OPA’s Astronomy for Astrologers course before, the cost for taking the exam is $90.
*Please contact Angelina at Angelina@OPAastrology.org for a coupon code to use at checkout if you have taken the course before.
OPA is currently accepting astronomy course successful completion at Kepler College or the School for Traditional Astrology (STA), as credit toward OPA Certification. When you apply for OPA Professional Astrologer Certification at the completion of three Peer Groups, Astronomy, and Consulting Skills, you may provide proof of successful completion at these approved schools and be awarded astronomy credit.
Linea Van Horn
C.A., NCGR-PAA
. . . is the Astrologer at Large. Professional since 1998, Linea is Founder and President Emerita of the San Francisco Astrological Society (1992 – 2014). Formerly employed in the astrology Internet industry, Linea is an experienced astrological advisor, respected teacher, published author, and dynamic public speaker. She currently devotes herself to client work, teaching, writing, and community building in the San Francisco Bay Area. She is certified through the National Council for Geocosmic Research Professional Astrologer Alliance (NCGR-PAA) and the Organization for Professional Astrology (OPA). She serves on the Board of Examiners for NCGR. Member of AFAN, ISAR and OPA. Visit Linea’s website: www.AstrologerAtLarge.com
Geoff Gronlund
. . . is a certified evolutionary astrologer who has been studying astrology for over 30 years. He is certified by the Organization for Professional Astrology (2024) and Maurice Fernandez’s Comprehensive Diploma Program (2017). He also served on the OPA Board of Directors from 2017 to 2022.
Geoff is a practicing astrologer and teaches Astronomy for Astrologers for both OPA and Kepler College.
Registration
$360 members
$460 non-members
After Sept 20 2026
$435 members
$535 non-members
Members: Use Member-Astronomy-2026 code at checkout for member discount.
Not a member? Join OPA Here >
International non-member pricing – $295
(Use code International295AA at checkout)
International member pricing – $195
(Use International295AA and Member-Astronomy-2026 codes)
* includes Turkey, Greece, Mexico, Brazil, South Africa, and all of South and Central America
