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An interactive group for users of Coronado sun filters. Learn more about how to get the most out of your equipment and observing. Keywords: solar filter sunspots spots hydrogen-alpha h-alpha astronomy observe
- Solar System
- Apr 2, 2001
- This is a public group.
- Attachments are permitted.
- Members cannot hide email address.
- Listed in Yahoo Groups directory.
- Membership does not require approval.
- Messages are not moderated.
- All members can post messages.