| December 21 | Leap | Leap+1 | Leap+2 | Leap+3 |
| 1950 | 4 SGR | 4 SGR | 4 SGR | 4 SGR |
| 2000 | 4 SGR | 4 SGR |
Use 4 Sagittarius for Leap+2 and Leap+3 years in the 2000 era.
Name: 4 SGR
Birthday from Jack’s initial research: Dec 21
Magnitude: 4.7
Spectrum/Star type: Blue
Distance in Light Years: 435
Diameter compared to Sun: about 3x
Luminosity compared to Sun: about 50x
Date best observed: Aug 5
Additional information: This star is near the position of the December Solstice and the Lagoon Nebula, M8.