Solar projection: which way is up?

[Teletom]

I was watching the Mercury transit yesterday and took a few drawings off the images projected by my Newtonian. I'd like to get the directions right on the drawings. Where do S and W lie? I thought I had it worked out but I'm not so sure.  And where can I find an explanation of the optical processes involved in the reversing, flipping, etc of images in optical trains? Thanks!

[Moonshane]

I generally work on the basis that west is the direction of travel with the western limb being the first to go that way.

In terms of image this explains it pretty well I think

https://www.telescopes.com/blogs/helpful-information/18943492-image-orientation-why-is-everything-upside-down

[Linda]

Good that you remind me with your question. I have just posted some sketches without giving the wind directions a thought. I guess it is a good habit, adding those to the sketch.

[Teletom]

Thanks! I'll look into that.

[Teletom]

1 hour ago, Teletom said:

I was watching the Mercury transit yesterday and took a few drawings off the images projected by my Newtonian. I'd like to get the directions right on the drawings. Where do S and W lie? I thought I had it worked out but I'm not so sure.  And where can I find an explanation of the optical processes involved in the reversing, flipping, etc of images in optical trains? Thanks!

Thanks!