I figure I should say who I am before I start slinging words out.  My name is Barry Morrison, and I work with Scott as a System’s Administrator.  I’ve been in IT since 2003, I’ve been in my current position since 2007.  My primary background is in Windows desktop/server administration, but my focus more so recently has been on storage (NetApp and Data Domain), backups and whatever else (that isn’t windows) I can get my hands on.  I’m very passionate about technology, combined with my short attention span, I like to play with everything.  I’ve recently taken a liking to Powershell (I hear the cringes now), and will now script everything I possibly can.  It has also helped me branch into other languages (Sh/Bash/Python — which I hope to do a lot more of).  So I’ll take it!

Why am I here?  Scott invited me, and we have a few ideas I think we’re both excited about regarding this particular blog space.  I think most of the code I write will be posted here, and less on my personal site going forward.  Seems more fitting here.  Thanks again Scott for the invite.  I hope I do your site justice!

So for those that read my blog you may notice that all of my *personal* posts are gone, this is not because I hate everyone and don’t wish them to see into my life, it is that I have moved all of my personal stuff here to my other blog that way I can keep codetwit more technology biased. Also am going to start having some guest posters who I believe have a lot to share, as always thanks for listening!

This is an old post from an old blog of mine, but I figured it might still be applicable.

Oh and I got a snazzy new watch that tells the moon phase and tide phase and thought that I would post the formula and answer to the San Diego Lunitidal hours interval:

The formula as you will find on the noaa website is in this F.A.Q.

Local Interval = GI – (0.069 * L)

• Where L is the longitude for the location in degrees. West longitudes are positive; East longitudes are negative.
  Example: 122 degrees 23.7 minutes West would be 122.395 degrees. (23.7 / 60 = 0.395)
• Longitude for a station is available from the Accepted Datums page by using the link provided for further station information.
• Where GI is the Greenwich Interval. To calculate the High Tide Local Interval, use the Greenwich Mean High Water Interval in Hours from the Accepted Datums page. To calculate the Low Tide Local Interval, use the Greenwich Mean Low Water Interval in Hours.
• Some products will require the Local Interval to be a positive number. You can convert a negative interval to a positive by adding 12.42 to the result.
  For example, if your interval calculated to be -4.11; you could also use 8.31 (-4.11 + 12.42 = 8.31)

While this looks all dandy, here is how to get the answer (for La Jolla which is closest to me, and where I will be diving)
La Jolla HWI

Check the HWI (Greenwich High Water Interval) which for La Jolla is 5.01 so the formula looks like

L: -117.257 (close enough)
0.069 * -117.257 = 8.09
5.01 – 8.09 = -3.08
-3.08 + 12.42 = 9:34 (Local Time Interval for La Jolla).

Share and Enjoy!