Portland Oregon 10-5-2019 20:55

8 7/8 inches
Size of Moon on my computer screen.
Moon viewed using ORION Sirius Plossl 25mm Lens. I may measure Moon at two points. Half of the Moon at a time, for total size.
May 10 2019 9 6/8 inches
May 11 2019 9 6/8 inches
May 12 2019 9 2/8 inches
May 14 2019 9 2/8 Inches
May 22 2019 8 inches
June 10 2019 9 2/8 inches
June 11 2019 9 4/8 inches
June 13 2019 8 7/8 inches
June 14 2019 9 inches
June 15 2019 8 7/8 inches
June 16 2019 8 5/8 inches
June 18 2019 8 5/8 inches
June 19 2019 8 5/8 inches
June 24 2019 8 7/8 inches
July 19 2019 8 7/8 inches
July 20 2019 8 3/8 inches
July 21 2019 8 3/8 inches
July 22 2019 8 5/8 inches
July 23 2019 8 2/8 inches
July 24 2019 8 6/8 inches my measurements are varying a bit
July 25 2019 8 7/8 inches
July 26 2019 8 7/8 inches
Aug 11 2019 8 6/8 inches
Aug 19 2019 8 5/8 inches
Aug 24 2019 8 5/8 inches
Aug 25 2019 9 5/8 inches Large one day difference. *****
Sept 6 2019 8 6/8 inches
Oct 5 2019 8 7/8 inches

Old measurements with last telescope.
March 9 2018 5 5/8 inches ***
Sept 5 2018 6 6/8 inches ***
I get a difference of 9/8 inches
6 6/8 inches is 54 1/8 ths. 6 6/8 minus 5 5/8 is 9/8th or 9 of 54 for 16.7 percent difference.
14 percent is the amount the moon should change in size due to the moons orbit.
In my rough estimation I see a problem. I will continue observing.
Always error in measurement. I will chose the lower of any 1/16 that is between the eighths.
We have have to look at long term averages.