Find Data
Variable Star Index
VSX
Photometry
WebObs
Spectroscopy
AVSpec
Exoplanets
Exosite
Solar Data
Download Data
AID
Variable Star Index
VSX
Photometry
WebObs
Spectroscopy
AVSpec
Exoplanets
Exosite
Solar Data
Download Data
AID
Submit Feedback
Observe
Observing Campaigns
Variable Star Plotter
VSP
Observing Campaigns
Variable Star Plotter
VSP
Submit Feedback
Process Data
Photometric Reduction
VPhot
Photometric Reduction
VPhot
Submit Feedback
Submit Data
Photometry
WebObs
Spectroscopy
AVSpec
Exoplanets
Exosite
Photometry
WebObs
Spectroscopy
AVSpec
Exoplanets
Exosite
Submit Feedback
Tools
Julian Date Calculator
Telescope Time
AAVSOnet
Journal
JAAVSO
Julian Date Calculator
Telescope Time
AAVSOnet
Journal
JAAVSO
Submit Feedback
Who We Are
About Us
Awards
Board
Blog
Staff
Policies
Contact Us
Getting Started
What Are Variable Stars?
Tutorials
Manuals
Find a Mentor
Community
Meetings
Forums
Find a Member
AAVSO Communications
Programs & Events
Get Involved
Welcome
Research Opportunities
Volunteer Opportunities
Become a Member
FAQ
Store
Open sidebar
Donate
Sign up
Sign in
About Us
Get Started
Forums
Contact Us
Donate
Home
JAAVSO
Article
Introduction
Volume 22 number 1
(1993)
Steve B. Howell
Abstract
Not Available
