The "ideal" diagonal star table is a conceptual schema used for discussing the surviving star tables, all of which contain some elements of the ideal, and none of which conform to the ideal exactly.

Identification
Label Ideal
Group/Type Diagonal star tables of types T, K, and X conform to this framework
Major Publications

Neugebauer and Parker (1960), Figure 1 on Page 1 shows a similar schematic.  Our version differs by labelling list columns C1-C4 (rather than 37-40) and denoting date row, horizontal strip, and vertical strip by DR, HS, and VS (rather than T, R, and V).

 

Characteristics
Rows 12, labelled 1 (top) to 12 (bottom)
Date Row Labelled DR, showing the twelve months of the Egyptian civil year I Akhet to IIII Shemu
Columns 36, labelled 1 (rightmost) to 36 (leftmost), each representing a ten-day period (decade) of the Egyptian civil year (three columns per month) + 4 list columns labelled C1-C4
Pattern The diagonal pattern is well-ordered and the decan list is complete:  36 ordinary decans (labelled 1-36) and 12 triangle decans (labelled A-L)
Vertical Strip

Indicated by a blank column labelled VS

Horizontal Strip Indicated by a blank row labelled HS

 

Schematic

Ideal