| Differences of Solstices | ΔT [hr] | ΔIR/IW) | Rate ΔIR/IW |
| 1st - 3rd | 7959.59 | 0.12 ± 0.06 | 15.1 × 10−6 |
| 2nd - 4th | 8729.00 | 0.15 ± 0.01 | 17.2 × 10−6 |
| 3rd - 5th | 8788.16 | 0.02 ± 0.01 | 2.27 × 10−6 |
| 4th - 6th | 8732.16 | 0.05 ± 0.01 | 5.72 × 10−6 |
| 5th - 7th | 7894.59 | 0.25 ± 0.05 | 31.7 × 10−6 |