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Re: Neat video about LEM stellar alignment scope
From: Don Seltzer
Date: 2016 Jun 9, 11:03 -0400
From: Don Seltzer
Date: 2016 Jun 9, 11:03 -0400
Yes, I also think that those are likely typos, but I wanted to copy exactly what was published.
Don Seltzer
Sent from my iPad
Sent from my iPad
Don
There appear to be typographical errors in that text.
The counter reads in degrees to within ±0.02" or ±72 seconds.
Shouldn't it read to ±0.02°, not ±0.02"?The maximum reading is 359.88 degrees.
Shouldn't it read to 359.98 degrees?Obviously, this takes nothing away from the intent or data of the paragraph. I just puzzled over it for a moment or two until it made sense.
Brad
On Jun 8, 2016 7:55 PM, "Don Seltzer" <NoReply_Seltzer@fer3.com> wrote:On Wed, Jun 8, 2016 at 5:08 AM, Gary LaPook <NoReply_LaPook@fer3.com> wrote:I wonder what what level of precision they achieved (needed) for this method of measuring angles to celestial objects.It doesn't exactly answer the intent of your question, but I did dig up the following:
A reticle control enables manual rotation of the reticle for use in lunar surface alignments. A counter on the left side of the unit, provides angular readout of the reticle rotation. The counter reads in degrees to within ±0.02" or ±72 seconds. The maximum reading is 359.88 degrees, then the Counter returns to 0 degrees. Interpolation is possible to within ±0.01 degrees.Don Seltzer
