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Re: Lunars with SNO-T
From: Alexandre Eremenko
Date: 2004 Oct 25, 16:09 -0500
From: Alexandre Eremenko
Date: 2004 Oct 25, 16:09 -0500
Dear George, Thank you for finding the misprint in my table, and for your other illuminating comments. (I was surprised myself that averaging of such "so-so" observations miraculously gave zero error). I am posting the corrected table, including the rejected "blunder" observation which was not included in my earlier posting. Please notice: it was rejected BEFORE any reduction. I would always reject such an observation. I am waiting for your opinion whether my procedure was sound or not. AP: N 40d27.2' W 86d55.8' GMT: 4:00 Oct 24, T=58F Pressure 29.75 Observation from my balcony, height 12ft, Sextant SNO-T, index correction 0.0', inverting scope. One of the 6 observations (column 4) was immediately rejected because it did not follow the pattern of increasing distances. I reduced with Frank Reed's on-line calculator. First, each measurement, and then their average. The third line is the error in the distance, the fourth line is the error in the longitude: Moon-Altair: GMT 4:06:49 4:09:58 4:13:10 4:14:58 4:17:12 4:18:57 DIST 51d22.2' 51d23.3' 51d23.8' 51d22.4' 51d24.1' 51d24.3' ERD 0.0' +0.5' +0.3' -1.5' -0.2' -0.4' ERL +0.3' +13.5' +8.7' -44.0' -7.3' -12.2' After the rejection of column 4: AVERAGE GMT: 4:13:13 AVERAGE DIST: 23.54' ERROR IN DISTANCE: 0.0' ERROR IN LONG: 0.4' > It was Alex's lucky day. I understand this is not a compliment:-) I will try to repeat it today, thank God, the weather is perfect. Alex.