When you see crepuscular rays coming down, as linked below, does the light look parallel to you? Or does it look like we have a small local sun, which you can trace the rays back to their source?
Anyway, forget the sundial thing. Just focus on local aparent noon, that is when the sun is highest in the sky at your given longitude on earth. If the globe earth is on a 23.4° tilt, then the spring and fall equinox would cast shadows at noon in radically different directions. The winter and summer solstice would both cast shadows directly north (or south depending on latitude), though the length of the shadow would be different.
I understand the procession of the equinox, that is not what I was talking about, although both models agree it occures. The analemma explains why an unadjusted sundial will drift between 15 minutes early to 15 minutes late throughout the year. This angle is very small though, about 3.75° of error maximum.
When you see crepuscular rays coming down, as linked below, does the light look parallel to you? Or does it look like we have a small local sun, which you can trace the rays back to their source?
https://epod.usra.edu/blog/2020/07/crepuscular-rays-off-la-palma-canary-islands.html
Anyway, forget the sundial thing. Just focus on local aparent noon, that is when the sun is highest in the sky at your given longitude on earth. If the globe earth is on a 23.4° tilt, then the spring and fall equinox would cast shadows at noon in radically different directions. The winter and summer solstice would both cast shadows directly north (or south depending on latitude), though the length of the shadow would be different.
I understand the procession of the equinox, that is not what I was talking about, although both models agree it occures. The analemma explains why an unadjusted sundial will drift between 15 minutes early to 15 minutes late throughout the year. This angle is very small though, about 3.75° of error maximum.