[Aavso-photometry] Airmass Planner web tool

[Michael Newberry]

For anyone interested, we've added an "Airmass Planner" to the web tools on 
our website. This tool calculates and tabulates the airmass and hour angle 
for an object at a date & time or over a range of time. Those planning 
photometry or observing runs may find it useful.

Go to http://www.mirametrics.com and select "Web Tools" from the left menu. 
You'll see the link on that page.

Michael Newberry