2017 Edition Updates

On p. 84, the coordinates for Old Man On His Back Conservation Area should be 49° 7′ 48″ N, 109° 7′ 12″ W

On pp. 165 to 170, small errors crept into the calculations, giving incorrect data. The corrected tables are shown below as PDFs, one for each page. The position angle "P" is in degrees.

On pp. 174 and 175, the table published has zeroes where there should be blanks in the "d" column, and the numerals in the "m" column should all have a decimal value, even the zeroes. See PDF below.

On p. 225, Saturn's ring-tilt values are incorrectly given as heliospheric. The geospheric values are:

2017
Jan. 1   26.8
Feb. 1   26.7
Mar. 1   26.5
Apr. 1    26.4
May 1    26.4
Jun. 1    26.5
Jul. 1     26.7
Aug. 1   26.8
Sep. 1   26.9
Oct. 1    27.0
Nov. 1    27.0
Dec. 1   26.8
2018
Jan. 1    26.5

On p. 249, the entry for Jan. 30 should read "Venus’s 30" disk will be 41% sunlit." (arcseconds, not degrees)

Author: 
WMacDonald
Last modified: 
Sunday, January 29, 2017 - 5:08pm