Crater and system of rilles, the largest of which is clearly visible through a small telescope.

Origin: Impact and Tectonic     Diameter: 42 km   Rukl: 39,50    Type: Crater & Rill

Objects: Crüger, Darwin, Rimae Darwin, Sirsalis, Sirsalis A, Sirsalis (J, F, G, H)

Location: Home
Date: 2018-09-06 + 2019-04-17 + 2020-08-30
Time: 6:30 PM ADT + 9:50 PM AST + 9:15 PM ADT
Equipment: 6” Sky-Watcher Dobsonian
Eyepieces: Meade Super Plössl 9.7mm, Explore Scientific 4.7 
Magnification: x120, x255 
Seeing: Good (3)
Transparency: Good (3)

Observation #1:
Date: September 6, 2018
R1:
Sirsalis and Sirsalis A are SE of Grimaldi.
R2: Rimae Sirsalis is located SE of Sirsalis and appeared as a dark line on the lunar surface. I was able to follow it to near/below the crater Darwin.

Observation #2:
Date: April 17, 2019
C1:
 I was able to locate the secondary craters Sirsalis J, F, G and H.

Observation #3:
Date: August 30, 2020
C2:
Finally located the Rimae Darwin! It intersected Rimae Sirsalis that ran from Sirsalis/Sirsalis A south to the crater Darwin. It took a bit of time to see this but it was worth the time to adapt to the brightness to discern the rimae.

August 5, 2017 insert: Sirsalis and Sirsalis A: the left side was more shaded than the right
in the FOV and ‘darker’ than the surrounding terrain.
Refer to Explore the Moon (Telescope) – August 5, 2017 for further details.

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