| E | O (JD) | O (dat) | Period |
| -91 | 2420930 | 1916-03-07 | 233.09 |
| -84 | 2422575 | 1920-09-07 | 233.16 |
| -81 | 2423289 | 1922-08-22 | 233.72 |
| -79 | 2423745 | 1923-11-21 | 234.95 |
| -78 | 2423975 | 1924-07-08 | 235.27 |
| -77 | 2424209 | 1925-02-27 | 235.04 |
| -76 | 2424448 | 1925-10-24 | 235.58 |
| -73 | 2425163 | 1927-10-09 | 236.7 |
| -72 | 2425400 | 1928-06-02 | 236.83 |
| -65 | 2427045 | 1932-12-03 | 236.87 |
| -64 | 2427292 | 1933-08-07 | 236.9 |
| -63 | 2427529 | 1934-04-01 | 236.67 |
| -62 | 2427760 | 1934-11-18 | 236.65 |
| -61 | 2428003 | 1935-07-19 | 236.05 |
| -59 | 2428478 | 1936-11-05 | 234.58 |
| -56 | 2429185 | 1938-10-13 | 234.5 |
| -55 | 2429413 | 1939-05-29 | 234.26 |
| -53 | 2429881 | 1940-09-08 | 233.19 |
| -50 | 2430570 | 1942-07-29 | 233.63 |
| -47 | 2431285 | 1944-07-13 | 234.66 |
| -45 | 2431740 | 1945-10-11 | 235.01 |
| -44 | 2431970 | 1946-05-29 | 235.46 |
| -36 | 2433870 | 1951-08-11 | 235.6 |
| -8 | 2440450 | 1969-08-16 | 235.58 |
| -7 | 2440700 | 1970-04-23 | 235.67 |
| -5 | 2441178 | 1971-08-14 | 235.53 |
| -4 | 2441410 | 1972-04-02 | 235.6 |
| -2 | 2441875 | 1973-07-11 | 234.95 |
| 0 | 2442338 | 1974-10-17 | 233.27 |
| 1 | 2442580 | 1975-06-16 | 233.57 |
| 3 | 2443049 | 1976-09-27 | 233.83 |
| 4 | 2443270 | 1977-05-06 | 233.91 |
| 6 | 2443740 | 1978-08-19 | 234.24 |
| 8 | 2444220 | 1979-12-12 | 234.52 |
| 9 | 2444443 | 1980-07-22 | 235.36 |
| 12 | 2445150 | 1982-06-29 | 235.8 |
| 14 | 2445624 | 1983-10-16 | 235 |
| 15 | 2445868 | 1984-06-16 | 234.46 |
| 17 | 2446335 | 1985-09-26 | 234.86 |
| 18 | 2446570 | 1986-05-19 | 235.53 |
| 20 | 2447030 | 1987-08-22 | 235.39 |
| 21 | 2447260 | 1988-04-08 | 234.53 |
| 22 | 2447500 | 1988-12-04 | 234.37 |
| 23 | 2447749 | 1989-08-10 | 235.31 |
| 24 | 2447980 | 1990-03-29 | 236.56 |
| 25 | 2448210 | 1990-11-14 | 237.35 |
| 26 | 2448445 | 1991-07-07 | 236.44 |
| 28 | 2448920 | 1992-10-24 | 236.58 |
| 29 | 2449155 | 1993-06-16 | 238.35 |
| 31 | 2449640 | 1994-10-14 | 238.81 |
| 32 | 2449865 | 1995-05-27 | 239 |
| 34 | 2450359 | 1996-10-02 | 239.45 |
| 35 | 2450598 | 1997-05-29 | 238.47 |
| 37 | 2451072 | 1998-09-15 | 238.44 |
| 38 | 2451312 | 1999-05-13 | 238.65 |
| 39 | 2451552 | 2000-01-08 | 236.06 |
| 40 | 2451774 | 2000-08-17 | 235.07 |
| 41 | 2452023 | 2001-04-23 | 235 |
| 42 | 2452258 | 2001-12-14 | 233.79 |
| 43 | 2452476 | 2002-07-20 | 233.71 |
| 44 | 2452720 | 2003-03-21 | 233.36 |
| 45 | 2452954 | 2003-11-10 | 232.57 |
| 46 | 2453183 | 2004-06-26 | 233.47 |
| 47 | 2453415 | 2005-02-13 | 232.87 |
| 48 | 2453649 | 2005-10-05 | 231.81 |
| 49 | 2453888 | 2006-06-01 | 232.44 |
| 51 | 2454348 | 2007-09-04 | 232.69 |
| 52 | 2454574 | 2008-04-17 | 232.87 |
| 53 | 2454809 | 2008-12-08 | 233.06 |
| 54 | 2455047 | 2009-08-03 | 233.31 |
| 55 | 2455274 | 2010-03-18 | 234.81 |
| 56 | 2455516 | 2010-11-15 | 235.75 |
| 57 | 2455750 | 2011-07-07 | 234.94 |
| 59 | 2456219 | 2012-10-18 | 234.75 |
| 60 | 2456460 | 2013-06-16 | 235.12 |
| 61 | 2456695 | 2014-02-06 | 235.12 |
| 62 | 2456920 | 2014-09-19 | 235.2 |
| 63 | 2457157 | 2015-05-14 | 234.29 |
| 64 | 2457395 | 2016-01-07 | 234.07 |
| 65 | 2457633 | 2016-09-01 | 234.86 |
| 66 | 2457864 | 2017-04-20 | 235.43 |
| 67 | 2458095 | 2017-12-07 | 235.07 |
| 68 | 2458337 | 2018-08-06 | 234.14 |
| 69 | 2458566 | 2019-03-23 | 234.43 |
| 70 | 2458807 | 2019-11-19 | 235.36 |
| 71 | 2459036 | 2020-07-05 | 235.1 |
| 72 | 2459270 | 2021-02-24 | 234.83 |
| 73 | 2459509 | 2021-10-21 | 234.5 |
| 74 | 2459745 | 2022-06-14 | 233.2 |
| 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. |