For two thousand years the Sun was held to be a flawless, unchanging fire. Then the telescope revealed spots crawling across its face — and Christoph Scheiner tracked them, day after day, proving the Sun was blemished, and turning. His great treatise laid out the observations in beautiful sequence, the dark spots drifting across the solar disc like weather. Another pillar of the old cosmos quietly falling: even the Sun, it turned out, was a changeable, spinning world.

Maker: Christoph Scheiner
Date: 1626–1630
Medium of the original: Plate
Original held by: Published Bracciano · Linda Hall Library
Credit: Published Bracciano · Linda Hall Library
Rights: Public domain, verified
Catalogue number: PA-00976

As chosen: 18 x 24 in, art print, classic frame
Picture	18 x 24 in
Outside size	19.6 x 25.6 in
Depth	0.9 in (22 mm)
Weight	[[REAL PROOF NEEDED: shipped weight per size and frame]]
Hanging	[[REAL PROOF NEEDED: hanging hardware Prodigi fits to this frame]]
Material	Enhanced matte art paper, 200 gsm; acrylic glazing
Made in	Charlotte, North Carolina, by Prodigi

Before a size goes on sale, the file is measured against it: pixels per inch at that size, how much of the picture a crop would lose, tone and sharpness. A size that fails is not offered, so there is nothing to choose wrong.

How the print check works

Sizes offered
Size	dpi	Grade	How it fits
8 x 10 in	419	Excellent	Trimmed 4.3%
11 x 14 in	305	Excellent	Trimmed 2.5%
12 x 16 in	274	Excellent	Trimmed 2.1%
16 x 20 in	209	Excellent	Trimmed 4.3%
18 x 24 in	182	Good	Trimmed 2.1%

Sizes withheld
Size	Why
8 x 12 in	Wrong shape: a 13% crop
12 x 18 in	Wrong shape: a 13% crop
16 x 24 in	Wrong shape: a 13% crop
20 x 30 in	Wrong shape: a 13% crop
24 x 30 in	140 dpi; a historical scan is never enlarged
24 x 36 in	Wrong shape: a 13% crop
30 x 40 in	109 dpi; a historical scan is never enlarged
36 x 48 in	91 dpi; a historical scan is never enlarged
40 x 60 in	Wrong shape: a 13% crop