Portland Oregon Moon Dec 13 2018 18:05. Measured At 1:24 5 6/8 Inches

Moon viewed using MEADE MA20mm Lens.
Size of Moon on my computer screen.
As you can see the size of the object changes. Another error.
This is all an estimate.

Jan 30 2018 6 5/8 inches
Feb 3 2018 6 3/8 inches
Feb 5 2018 5 7/8 inches
Feb 7 2018 6 inches
Feb 22 2018 6 2/8 inches
Feb 23 2018 6 6/8 inches ***
Feb 24 2018 6 4/8 inches
Feb 25 2018 6 5/8 inches
Feb 26 2018 6 5/8 inches
Feb 28 2018 6 4/8 inches
March 1 2018 6 3/8 Inches
March 2 2018 6 2/8 inches
March 3 2018 6 inches
March 6 2018 5 7/8 inches
March 7 2018 5 7/8 inches
March 9 2018 5 5/8 inches ***
March 10 2018 5 6/8 inches
March 11 2018 5 5/8 inches ***
March 12 2018 5 5/8 inches ***
March 20 2018 6 2/8 inches
March 22 2018 6 3/8 inches
March 25 2018 6 2/8 inches
March 26 2018 6 3/8 inches
March 27 2018 6 4/8 inches
March 28 2018 6 3/8 inches
March 29 2018 6 2/8 inches
March 30 2018 6 5/8 inches bit of a jump
March 31 2018 6 inches another jump?
April 2 2018 6 1/8 inches
April 3 2018 5 7/8 inches
April 18 2018 6 4/8 inches
April 19 2018 6 5/8 Inches
April 21 2018 6 4/8 inches
April 22 2018 6 6/8 inches ***
April 23 2018 6 4/8 inches.
April 24 2018 6 2/8 inches.
April 25 2018 6 4/8 inches.
April 26 2018 6 1/8 inches.
April 27 2018 6 1/8 inches.
May 2 2018 5 6/8 inches
May 3 2018 5 5/8 inches ***
May 6 2018 5 5/8 inches ***
May 18 2018 6 4/8 inches
May 20 2018 6 6/8 inches ***
May 21 2018 6 2/8 inches
May 22 2018 6 1/8 inches
May 25 2018 5 7/8 inches A bit smaller than 28 days ago.
May 26 2018 5 7/8 inches
May 27 2018 5 7/8 inches
May 28 2018 5 6/8 inches with bluish edged moon
May 30 2018 5 6/8 inches
May 31 2018 5 5/8 inches ***
June 1 2018 5 5/8 inches ***
June 2 2018 5 5/8 inches ***
June 3 2018 5 5/8 inches ***
June 6 2018 5 6/8 inches
June 9 2018 6 1/8 inches
June 18 2018 6 2/8 inches
June 19 2018 6 1/8 inches
June 21 2018 6 1/8 inches (Not Sure)
June 23 2018 5 7/8 inches
June 25 2018 5 5/8 inches ***
June 27 2018 5 6/8 inches
June 30 2018 5 5/8 inches
July 5 2018 6 1/8 inches
July 17 2018 6 2/8 inches
July 18 2018 6 2/8 inches (Lose quality when I rotate)
July 19 2018 6 1/8 inches
July 20 2018 6 2/8 inches
July 21 2018 5 7/8 inches Bit of a change.
July 23 2018 5 6/8 inches Blue and Greenish Moon edges
July 28 2018 5 6/8 inches Blueish edge
July 31 2018 6 1/8 inches Greenish edge
August 4 2018 6 2/8 inches
August 5 2018 6 2/8 inches
August 6 2018 6 3/8 inches
August 7 2018 6 3/8 inches
August 17 2018 6 inches
August 18 2018 5 7/8 inches
August 19 2018 6 inches
August 20 2018 5 7/8 inches
August 21 2018 5 6/8 inches
August 22 2018 5 6/8 inches
August 24 2018 6 inches
August 28 2018 6 inches
Sept 1 2018 6 1/8 inches
Sept 2 2018 6 4/8 inches
Sept 3 2018 6 3/8 inches
Sept 4 2018 6 2/8 inches
Sept 5 2018 6 6/8 inches ***
Sept 16 2018 6 1/8 inches
Sept 17 2018 6 inches
Sept 25 2018 6 3/8 inches Bluish edge to Moon
Sept 27 2018 6 4/8 inches
Sept 29 2018 6 5/8 inches
Oct 3 2018 6 6/8 inches ***
Oct 4 2018 6 5/8 inches
Oct 13 2018 6 2/8 inches
Oct 15 2018 6 2/8 inches
Oct 16 2018 6 inches
Oct 17 2018 6 inches
Oct 18 2018 5 7/8 inches
Nov 13 2018 5 5/8 inches *** Not sure took 90 degrees out
Nov 17 2018 6 2/8 inches
Nov 18 2018 6 1/8 inches
Nov 19 2018 6 1/8 inches
Nov 20 2018 6 4/8 inches
Nov 21 2018 various size
Nov 30 2018 6 3/8 inches
Dec 13 2018 5 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 will change in size due to the moons orbit.
In my rough estimation I see a problem. I will continue observing.
Get to 20 percent, I will think KEEP PORTLAND WEIRD.

Using the same lens from now on.

Always error in measurement. I will chose the lower of any 1/16 that is between the eighths.

SO, If I show a Moon half this size with the same telescope and lens then by using observation I can conclude that things are way foweled up.

OK this is some delicate stuff for the instruments I have. Have to look at long term averages.