| E | O (JD) | O (dat) | Period |
| -42 | 2417852 | 1907-10-03 | 371.83 |
| -20 | 2425975 | 1929-12-29 | 370.81 |
| -19 | 2426360 | 1931-01-18 | 370.26 |
| -18 | 2426751 | 1932-02-13 | 369.21 |
| -10 | 2429719 | 1940-03-30 | 368.84 |
| -1 | 2433026 | 1949-04-19 | 368.72 |
| 0 | 2433410 | 1950-05-08 | 368.49 |
| 27 | 2443300 | 1977-06-05 | 368.11 |
| 29 | 2444050 | 1979-06-25 | 367.72 |
| 30 | 2444420 | 1980-06-29 | 367.49 |
| 33 | 2445540 | 1983-07-24 | 368.12 |
| 34 | 2445900 | 1984-07-18 | 370.67 |
| 36 | 2446630 | 1986-07-18 | 370.25 |
| 37 | 2447000 | 1987-07-23 | 368.94 |
| 38 | 2447380 | 1988-08-06 | 368.25 |
| 39 | 2447754 | 1989-08-15 | 369.53 |
| 40 | 2448121 | 1990-08-17 | 370.21 |
| 41 | 2448480 | 1991-08-11 | 369.29 |
| 42 | 2448852 | 1992-08-17 | 367.86 |
| 43 | 2449221 | 1993-08-21 | 367.07 |
| 44 | 2449592 | 1994-08-27 | 368.43 |
| 45 | 2449958 | 1995-08-28 | 370.29 |
| 46 | 2450326 | 1996-08-30 | 371.36 |
| 47 | 2450688 | 1997-08-27 | 372.14 |
| 48 | 2451071 | 1998-09-14 | 371.79 |
| 49 | 2451445 | 1999-09-23 | 371.86 |
| 50 | 2451827 | 2000-10-09 | 372.79 |
| 51 | 2452196 | 2001-10-13 | 372.71 |
| 52 | 2452559 | 2002-10-11 | 371.64 |
| 53 | 2452931 | 2003-10-18 | 370.29 |
| 54 | 2453302 | 2004-10-23 | 368.71 |
| 55 | 2453675 | 2005-10-31 | 368.5 |
| 56 | 2454044 | 2006-11-04 | 368.36 |
| 57 | 2454412 | 2007-11-07 | 367.43 |
| 58 | 2454773 | 2008-11-02 | 366.36 |
| 59 | 2455141 | 2009-11-05 | 365.43 |
| 60 | 2455506 | 2010-11-05 | 365.5 |
| 61 | 2455871 | 2011-11-05 | 366 |
| 62 | 2456235 | 2012-11-03 | 366.07 |
| 63 | 2456600 | 2013-11-03 | 365.86 |
| 64 | 2456973 | 2014-11-11 | 365.93 |
| 65 | 2457336 | 2015-11-09 | 365.71 |
| 66 | 2457703 | 2016-11-10 | 365.93 |
| 67 | 2458066 | 2017-11-08 | 366.57 |
| 68 | 2458434 | 2018-11-11 | 366.79 |
| 69 | 2458792 | 2019-11-04 | 366.63 |
| 70 | 2459166 | 2020-11-12 | 366.49 |
| 71 | 2459539 | 2021-11-20 | 366.83 |
| 72 | 2459905 | 2022-11-21 | 366.6 |
| 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. |