H-R Diagram
Two editions. The 2024 edition of the Reference Tables was used for the June 2025 through August 2026 Regents examinations, and the past questions on this site were written for it. The 2026 Revised edition applies from the January 2027 exam onward, so a student preparing for January 2027 or later should practise with the 2026 Revised edition.
This site does not copy the reference tables. Open them on the NYSED website with the links below.
The two editions side by side
2024 edition
Used for the June 2025 through August 2026 Regents examinations.
Printed title: H-R Diagram
Where: page 4 of the PDF.
2026 Revised edition
Used for the January 2027 Regents examination onward.
Printed title: H-R Diagram
Where: page 4 of the PDF.
What changed in the 2026 Revised edition
- H-R Diagram redrawn: stars drawn as separate shaded balls with a key (supergiants, white dwarfs, main sequence, giants); the temperature axis is replaced by an 'Approximate Surface Temperature Range (K) of Stars' table by spectral class.
The editions were compared by eye on page images, so a small change in a number may be missed. The full list of differences is on the reference tables page.