| E | O (JD) | O (dat) | Period |
| -66 | 2425831 | 1929-08-07 | 272 |
| -64 | 2426331 | 1930-12-20 | 270.51 |
| -63 | 2426650 | 1931-11-04 | 271.08 |
| -62 | 2426900 | 1932-07-11 | 271.5 |
| -59 | 2427720 | 1934-10-09 | 272.02 |
| -47 | 2430952 | 1943-08-15 | 271.86 |
| -20 | 2438306 | 1963-10-03 | 271.28 |
| -19 | 2438588 | 1964-07-11 | 271.46 |
| -18 | 2438872 | 1965-04-21 | 271.52 |
| -16 | 2439392 | 1966-09-23 | 271.02 |
| -15 | 2439658 | 1967-06-16 | 269.05 |
| -13 | 2440208 | 1968-12-17 | 268.81 |
| -12 | 2440457 | 1969-08-23 | 268.73 |
| -11 | 2440726 | 1970-05-19 | 269.27 |
| -9 | 2441280 | 1971-11-24 | 269.24 |
| -7 | 2441825 | 1973-05-22 | 270.57 |
| -5 | 2442351 | 1974-10-30 | 271.95 |
| -4 | 2442623 | 1975-07-29 | 271.57 |
| -3 | 2442897 | 1976-04-28 | 270.54 |
| -1 | 2443450 | 1977-11-02 | 270.2 |
| 0 | 2443716 | 1978-07-26 | 270.59 |
| 3 | 2444536 | 1980-10-23 | 270.61 |
| 7 | 2445603 | 1983-09-25 | 270.29 |
| 11 | 2446679 | 1986-09-05 | 269.97 |
| 14 | 2447495 | 1988-11-29 | 269.65 |
| 15 | 2447767 | 1989-08-28 | 269.69 |
| 16 | 2448040 | 1990-05-28 | 270.54 |
| 18 | 2448575 | 1991-11-14 | 270.8 |
| 19 | 2448845 | 1992-08-10 | 270.3 |
| 20 | 2449115 | 1993-05-07 | 269.55 |
| 22 | 2449660 | 1994-11-03 | 269.7 |
| 23 | 2449930 | 1995-07-31 | 270.38 |
| 26 | 2450738 | 1997-10-16 | 270.73 |
| 27 | 2450999 | 1998-07-04 | 271.11 |
| 30 | 2451819 | 2000-10-01 | 271 |
| 31 | 2452090 | 2001-06-29 | 270.79 |
| 34 | 2452909 | 2003-09-26 | 271.09 |
| 35 | 2453186 | 2004-06-29 | 271.85 |
| 36 | 2453450 | 2005-03-20 | 272.21 |
| 37 | 2453717 | 2005-12-12 | 272.33 |
| 38 | 2453984 | 2006-09-05 | 272.25 |
| 39 | 2454271 | 2007-06-19 | 272.59 |
| 41 | 2454810 | 2008-12-09 | 273.44 |
| 42 | 2455091 | 2009-09-16 | 274.28 |
| 43 | 2455360 | 2010-06-12 | 274.44 |
| 45 | 2455910 | 2011-12-14 | 273.82 |
| 46 | 2456179 | 2012-09-08 | 272.63 |
| 47 | 2456459 | 2013-06-15 | 271.75 |
| 48 | 2456736 | 2014-03-19 | 271.25 |
| 49 | 2457000 | 2014-12-08 | 270.75 |
| 50 | 2457263 | 2015-08-28 | 270.56 |
| 51 | 2457536 | 2016-05-27 | 270.44 |
| 53 | 2458074 | 2017-11-16 | 270.69 |
| 54 | 2458347 | 2018-08-16 | 271.19 |
| 55 | 2458620 | 2019-05-16 | 272 |
| 56 | 2458902 | 2020-02-22 | 272.59 |
| 57 | 2459165 | 2020-11-11 | 273.46 |
| 58 | 2459437 | 2021-08-10 | 273.67 |
| 59 | 2459714 | 2022-05-14 | 273.8 |
| E | Cycle number from the GCVS4 epoch. |
| O (JD) | Julian date at observed time for maximum. |
| O (Dat) | Same as above, expressed as date. |
| Period | Calculated mean period at cycle number E. |