| E | O (JD) | O (dat) | Period |
| -85 | 2422700 | 1921-01-10 | 257.38 |
| -81 | 2423717 | 1923-10-24 | 255.73 |
| -80 | 2423977 | 1924-07-10 | 258.23 |
| -79 | 2424240 | 1925-03-30 | 257.5 |
| -78 | 2424495 | 1925-12-10 | 254.86 |
| -77 | 2424740 | 1926-08-12 | 254.17 |
| -76 | 2425029 | 1927-05-28 | 253.84 |
| -75 | 2425254 | 1928-01-08 | 253.54 |
| -64 | 2428044 | 1935-08-29 | 253.52 |
| -61 | 2428800 | 1937-09-23 | 253 |
| -60 | 2429063 | 1938-06-13 | 253.17 |
| -58 | 2429560 | 1939-10-23 | 254.26 |
| -57 | 2429816 | 1940-07-05 | 255.22 |
| -54 | 2430579 | 1942-08-07 | 255.3 |
| -51 | 2431350 | 1944-09-16 | 255.36 |
| -50 | 2431610 | 1945-06-03 | 255.67 |
| -47 | 2432380 | 1947-07-13 | 255.68 |
| -14 | 2440801 | 1970-08-02 | 255.56 |
| -13 | 2441060 | 1971-04-18 | 255.41 |
| -12 | 2441326 | 1972-01-09 | 255.27 |
| -11 | 2441569 | 1972-09-08 | 255.12 |
| -8 | 2442338 | 1974-10-17 | 254.66 |
| -7 | 2442587 | 1975-06-23 | 253.77 |
| -6 | 2442846 | 1976-03-08 | 253.5 |
| -5 | 2443091 | 1976-11-08 | 252.82 |
| -4 | 2443354 | 1977-07-29 | 250.64 |
| -3 | 2443600 | 1978-04-01 | 250.57 |
| -2 | 2443858 | 1978-12-15 | 251.07 |
| -1 | 2444094 | 1979-08-08 | 250.72 |
| 0 | 2444340 | 1980-04-10 | 250.57 |
| 1 | 2444601 | 1980-12-27 | 250.14 |
| 2 | 2444851 | 1981-09-03 | 250.64 |
| 3 | 2445104 | 1982-05-14 | 252.64 |
| 4 | 2445358 | 1983-01-23 | 252.5 |
| 5 | 2445602 | 1983-09-24 | 251.36 |
| 6 | 2445859 | 1984-06-07 | 252 |
| 7 | 2446112 | 1985-02-15 | 252.79 |
| 8 | 2446364 | 1985-10-25 | 252.85 |
| 9 | 2446607 | 1986-06-25 | 253.07 |
| 10 | 2446876 | 1987-03-21 | 253.57 |
| 11 | 2447125 | 1987-11-25 | 254.14 |
| 12 | 2447375 | 1988-08-01 | 255.57 |
| 13 | 2447629 | 1989-04-12 | 254.86 |
| 14 | 2447892 | 1989-12-31 | 254 |
| 15 | 2448142 | 1990-09-07 | 256.22 |
| 16 | 2448407 | 1991-05-30 | 257.29 |
| 17 | 2448644 | 1992-01-22 | 256.86 |
| 18 | 2448913 | 1992-10-17 | 256.22 |
| 19 | 2449174 | 1993-07-05 | 256.5 |
| 20 | 2449432 | 1994-03-20 | 258.36 |
| 21 | 2449685 | 1994-11-28 | 258.71 |
| 22 | 2449936 | 1995-08-06 | 257.07 |
| 23 | 2450204 | 1996-04-30 | 256.72 |
| 24 | 2450464 | 1997-01-15 | 256.86 |
| 25 | 2450715 | 1997-09-23 | 257.86 |
| 26 | 2450971 | 1998-06-06 | 257.5 |
| 27 | 2451229 | 1999-02-19 | 255.72 |
| 28 | 2451484 | 1999-11-01 | 255.79 |
| 29 | 2451747 | 2000-07-21 | 256.64 |
| 30 | 2451998 | 2001-03-29 | 256.57 |
| 31 | 2452250 | 2001-12-06 | 256.14 |
| 32 | 2452510 | 2002-08-23 | 255.36 |
| 33 | 2452769 | 2003-05-09 | 254.64 |
| 34 | 2453023 | 2004-01-18 | 254.29 |
| 35 | 2453276 | 2004-09-27 | 254.43 |
| 36 | 2453530 | 2005-06-08 | 253.86 |
| 37 | 2453780 | 2006-02-13 | 252.5 |
| 38 | 2454028 | 2006-10-19 | 252.21 |
| 39 | 2454294 | 2007-07-12 | 252.99 |
| 40 | 2454539 | 2008-03-13 | 253.64 |
| 41 | 2454788 | 2008-11-17 | 254.57 |
| 42 | 2455042 | 2009-07-29 | 254.49 |
| 43 | 2455306 | 2010-04-19 | 253.43 |
| 44 | 2455555 | 2010-12-24 | 254.14 |
| 45 | 2455817 | 2011-09-12 | 254.72 |
| 46 | 2456068 | 2012-05-20 | 254.14 |
| 47 | 2456313 | 2013-01-20 | 254.14 |
| 48 | 2456572 | 2013-10-06 | 253.86 |
| 49 | 2456824 | 2014-06-15 | 253.5 |
| 50 | 2457082 | 2015-02-28 | 254.43 |
| 51 | 2457337 | 2015-11-10 | 254.5 |
| 52 | 2457589 | 2016-07-19 | 255.72 |
| 53 | 2457845 | 2017-04-01 | 255.29 |
| 54 | 2458098 | 2017-12-10 | 253.43 |
| 55 | 2458350 | 2018-08-19 | 254.5 |
| 56 | 2458626 | 2019-05-22 | 255.36 |
| 57 | 2458854 | 2020-01-05 | 254.93 |
| 58 | 2459113 | 2020-09-20 | 255.03 |
| 59 | 2459376 | 2021-06-10 | 252.28 |
| 60 | 2459633 | 2022-02-22 | 253.42 |
| 61 | 2459879 | 2022-10-26 | 258.5 |
| 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. |