Tycho's lists of standards

Here are snapshots from Tycho's "Progymnasmata" document showing how he accumulated his standards stars. First, his starter set of four, my Group 1:

Then he added 5 more stars (my Group 2) to get to a set of 9 standards:

Then he added 12 more stars (my Group 3) to get a set of 21 standards:

Finally, he added 79 more stars (my group 4) to get a set of 100 standard stars:

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