--- Mel Richardson <[EMAIL PROTECTED]> wrote: > > Well, that is strange! With the 'short name' selected with my CdC > Vsn 2.75.3 and a star 'Limit: Magnitude' of 7 in Label Options, no > greek letters show but at 5 - 6, a few alphas & betas are displayed > then the gammas, deltas, eps etc. as this parameter is lowered toward > zero.
Right. This setting determines the brightness range of stars to label, so it doesn't try to label every star in the chart, if you don't want a cluttered chart. Someone gave the details here a week or two ago, but I think the number relates to the magnitude limits for displaying stars you set in preferences>catalogs..>Stars1. There you set limits for displaying stars, based on field width. Then the magnitude limit "n" you choose in the label options means that a star has to be "n" magnitudes above the star display limit to be labelled. So using a lower number means more stars will be labelled. If you use a low number (or a narrower field), stars that are so faint they have only a Flamsteed number, but not a Bayer greek designation, are also labelled. It doesn't matter whether you use "short name" to get just the greek letter (or Flamsteed number, etc), or the full name option. In either case, the same stars will be labelled if the other settings are the same. Beyer didn't have a hard-and-fast rule for how he labelled the stars, but most often he started with the brightest star in a constellation as alpha, and worked his way through the greek alphabet as star magnitudes decreased. So a high mag limit in the label options will label only alpha, beta.., while a lower number will go deeper into the alphabet. > And as I mentioned it also seems dependant on the true star > magnitudes in the constellation displayed. It depends just on the magnitudes of the individual stars. A bright constellation like Orion has many bright stars, so for given settings, more stars get labelled there than in a fainter constellation. > BTW, the greek designations are > always on screen in this condition. Left clicking will overprint the > Greek letter with the regular string of names and numbers. Any > thoughts on the difference? Left clicking "selects" the star, so more info is displayed. -John __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ------------------------ Yahoo! Groups Sponsor --------------------~--> What would our lives be like without music, dance, and theater? Donate or volunteer in the arts today at Network for Good! http://us.click.yahoo.com/TzSHvD/SOnJAA/79vVAA/1.XolB/TM --------------------------------------------------------------------~-> To Post a message, send it to: [email protected] To Unsubscribe, send a blank message to: [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/skychart-discussion/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
