| E | O (JD) | O (dat) | Period |
| -57 | 2426936 | 1932-08-16 | 274.49 |
| -53 | 2428045 | 1935-08-30 | 274.33 |
| -33 | 2433523 | 1950-08-29 | 274.03 |
| -29 | 2434613 | 1953-08-23 | 274.27 |
| -21 | 2436818 | 1959-09-06 | 274.41 |
| -18 | 2437634 | 1961-11-30 | 274.54 |
| -17 | 2437904 | 1962-08-27 | 275.22 |
| -16 | 2438188 | 1963-06-07 | 276.86 |
| -14 | 2438746 | 1964-12-16 | 278.04 |
| -13 | 2439020 | 1965-09-16 | 277.78 |
| -12 | 2439299 | 1966-06-22 | 278.95 |
| -10 | 2439884 | 1968-01-28 | 279.29 |
| -9 | 2440129 | 1968-09-29 | 280.05 |
| -8 | 2440409 | 1969-07-06 | 280.96 |
| -5 | 2441262 | 1971-11-06 | 279.96 |
| -4 | 2441537 | 1972-08-07 | 279.79 |
| -1 | 2442390 | 1974-12-08 | 280.57 |
| 0 | 2442672 | 1975-09-16 | 279.55 |
| 1 | 2442950 | 1976-06-20 | 278.54 |
| 4 | 2443778 | 1978-09-26 | 277.36 |
| 5 | 2444055 | 1979-06-30 | 275.41 |
| 7 | 2444605 | 1980-12-31 | 275.09 |
| 8 | 2444879 | 1981-10-01 | 275.13 |
| 9 | 2445150 | 1982-06-29 | 275.25 |
| 12 | 2445971 | 1984-09-27 | 275.04 |
| 13 | 2446253 | 1985-07-06 | 274.67 |
| 16 | 2447078 | 1987-10-09 | 274.87 |
| 17 | 2447361 | 1988-07-18 | 274.5 |
| 19 | 2447900 | 1990-01-08 | 273.41 |
| 20 | 2448176 | 1990-10-11 | 271.18 |
| 21 | 2448450 | 1991-07-12 | 269.25 |
| 24 | 2449259 | 1993-09-28 | 269.1 |
| 25 | 2449527 | 1994-06-23 | 268.83 |
| 26 | 2449770 | 1995-02-21 | 268.48 |
| 27 | 2450054 | 1995-12-02 | 267.89 |
| 28 | 2450320 | 1996-08-24 | 266.18 |
| 29 | 2450595 | 1997-05-26 | 267.33 |
| 31 | 2451132 | 1998-11-14 | 268.78 |
| 32 | 2451399 | 1999-08-08 | 268.48 |
| 34 | 2451912 | 2001-01-02 | 269.35 |
| 35 | 2452197 | 2001-10-14 | 269.79 |
| 36 | 2452465 | 2002-07-09 | 270.55 |
| 38 | 2453010 | 2004-01-05 | 272.88 |
| 39 | 2453292 | 2004-10-13 | 274.38 |
| 40 | 2453561 | 2005-07-09 | 274.63 |
| 41 | 2453840 | 2006-04-14 | 275.47 |
| 42 | 2454110 | 2007-01-09 | 275.58 |
| 43 | 2454389 | 2007-10-15 | 276.43 |
| 44 | 2454667 | 2008-07-19 | 276.57 |
| 45 | 2454940 | 2009-04-18 | 276.43 |
| 46 | 2455220 | 2010-01-23 | 278.36 |
| 47 | 2455503 | 2010-11-02 | 278.07 |
| 48 | 2455770 | 2011-07-27 | 276.43 |
| 49 | 2456050 | 2012-05-02 | 275.57 |
| 50 | 2456346 | 2013-02-22 | 273.93 |
| 51 | 2456603 | 2013-11-06 | 274 |
| 52 | 2456874 | 2014-08-04 | 274.28 |
| 53 | 2457144 | 2015-05-01 | 271.93 |
| 54 | 2457414 | 2016-01-26 | 272.14 |
| 55 | 2457695 | 2016-11-02 | 273.5 |
| 56 | 2457965 | 2017-07-30 | 274.14 |
| 57 | 2458238 | 2018-04-29 | 275.36 |
| 58 | 2458521 | 2019-02-06 | 275.08 |
| 59 | 2458785 | 2019-10-28 | 275.08 |
| 60 | 2459071 | 2020-08-09 | 275.71 |
| 61 | 2459342 | 2021-05-07 | 274.95 |
| 62 | 2459618 | 2022-02-07 | 276 |
| 63 | 2459893 | 2022-11-09 | 278.39 |
| 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. |