Field rotation on a Dobsonian: why your alt-az photos trail

The math behind rotation at 49°N, exposure limits by declination, and when an equatorial platform becomes the only fix.

What this post covers

This is placeholder body content for the EmDash + Astro build. Richard will rewrite it with the real write-up — code, photos, and the parts that actually broke.

Placeholder draft — not final copy. Seeded from blog-design.html to exercise the layout and Portable Text rendering.