The observer's personal equation
Add precision to your sunspot counts.
Published:
February 21, 2008
| In "How to observe the Sun," which appeared in the April 2008 issue of Astronomy, I described the Wolf Number, which is the way most astronomers count sunspots. Apart from being fun, sunspot counts provide a gauge of solar activity. Astronomers have kept track of sunspot numbers on a daily basis since the middle of the 18th century. |
You are currently not logged in. This article is only available to Astronomy magazine subscribers.
Already a subscriber to Astronomy magazine?
If you are already a subscriber to Astronomy magazine you must log into your account to view this article. If you do not have an account you will
need to regsiter for one. Registration is FREE and only takes a couple minutes.
Non-subscribers, Subscribe TODAY and save!
|
|
Get instant access to subscriber content on Astronomy.com!
- Access our interactive Atlas of the Stars
- Get full access to StarDome PLUS
- Columnist articles
- Search and view our equipment review archive
- Receive full access to our Ask Astro answers
- BONUS web extras not included in the magazine
- Much more!
|