The course is so long, I had to take the curvature of the Earth into consideration.
You encountered a misery near the end of the day and it took a while to gauge its full extent. Some miseries had sharp curvature and could be negotiated readily. Others had almost no curvature and you knew you'd be spending hours turning the corner. Great whopping-big planet-sized miseries.
It's a brilliant surface in that sunlight. The horizon seems quite close to you because the curvature is so much more pronounced than here on earth. It's an interesting place to be. I recommend it.
Well, it so happens that I have had a spinal curvature since I was about thirteen and every once in a while that has given me some trouble, and at that time it began to kick up again. and occasionally I have to get into bed and nurse a severe backache.
Arc, amplitude, and curvature sustain a similar relation to each other as time, motion, and velocity, or as volume, mass, and density.