Albert Y. Shih

The most frequent problem is the consequence of SDO (AIA and HMI) headers having the solar radius as 696 Mm, versus our default value being the IAU definition of 695.7...

See this forum thread: https://community.openastronomy.org/t/grid-on-an-image-difference-with-the-old-sunpy-version-and-the-5-0-0/766

Ha! Since this PR was originally mine before @wtbarnes took it over, GitHub won't let me approve it

What about something like this? 

Playing around: 

Here's less structure in the indicators:  

The invisible side. My thinking is that it's "safer" to plot extra gunk on that side.

> This should be closed? Why?

I appreciate that the rigor is frustrating here, but I'm not a fan of making this change. All of the loopback code – why `_times_are_equal()` even exists – was going...

It could also be annoying for off-disk helioprojective coordinates without a screen assumption