Talk:Henry Draper Catalogue

Comment
The expression "50 times dimmer" seems OK until you think about what it means, by strict reasoning. Using ordinary light sources as an example, let's say that the original source has a brightness of 1 lambert. 50 times that brightness is 50 lamberts, so a light source that is 50 times dimmer has a brightness of -49 lamberts! Even one time[s] dimmer would be totally dark. I'm not trying to be annoying, just hope to keep straight thinking in scientific writing. Best regards, Nikevich (talk) 07:51, 17 June 2008 (UTC)

External links modified
Hello fellow Wikipedians,

I have just added archive links to 1 one external link on Henry Draper Catalogue. Please take a moment to review my edit. If necessary, add after the link to keep me from modifying it. Alternatively, you can add to keep me off the page altogether. I made the following changes:
 * Added archive https://web.archive.org/20080509145504/http://www.willbell.com/software/hypersky/hd.htm to http://www.willbell.com/software/hypersky/hd.htm

When you have finished reviewing my changes, please set the checked parameter below to true to let others know.

Cheers. —cyberbot II  Talk to my owner :Online 10:10, 17 October 2015 (UTC)

External links modified (January 2018)
Hello fellow Wikipedians,

I have just modified one external link on Henry Draper Catalogue. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
 * Added archive https://web.archive.org/web/20080916100212/http://adc.gsfc.nasa.gov/adc/adccdrom3_doc.html to http://adc.gsfc.nasa.gov/adc/adccdrom3_doc.html

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

Cheers.— InternetArchiveBot  (Report bug) 21:16, 21 January 2018 (UTC)