Continuing what Dr. Zharkova has replied to so called former NASA Dr. Strong:
“Zharkova et al, 2018, JASTP, IAU proceeding (see http://solargsm.com/publicatioons) shown that these GSM occurred in the past (Maunder minimum, Wolf minimum, Oort minimum, Homeric minimum and many others.
“Recently, Zharkova et al 2023 https://www.scirp.org/journal/paperinformation?paperid=124007 with spectral methods shown the key frequencies/periods of oscillations in total solar irradiance (TSI) , they derived the periods of 350 years (T1) and 2200-2300 years (T2). This T1 is the averaged period of the GSM, which varies from 330 years for short but powerful grand solar cycles to 380-400 for long and weaker GSCs. While the two millennial period (T2) is associated with solar inertial motion and called Hallstatt’s cycle as described by the papers Zharkova et al, 2019 and the book chapter Zharkova, 2021 https://www.intechopen.com/chapters/75534.
“This period between GSM is calculated from the middle of the previous grand solar minimum to the next one. Hence thee previous GSM (1645-1715) had duration 70 years, half of it is 35. 1645+35= 1680. Then the next has should occur 1680 + 350= 2030 that is exactly when the middle of the modern GSM to occur.
“Dear Dr. Strong needs to improve his arithmetical skills I guess.”
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As I warned Dr. Zharkova is ALWAYS very scientific in her replies! So now you have places to visit on her WEBSITE.
BTW interestingly enough the MOON WOBBLE leading to worldwide FLOODING of numerous coastal areas like New Orleans begins occurring in 2030! Even NASA agrees!