Recently, I was made aware of this website. As the MUF is creeping up, it is worth a regular look. It may give a clue to possible 8m and 6m F2 openings.
See https://www.sws.bom.gov.au/HF_Systems/6/5 - this gives the MUF for vertical incidence.
See also https://prop.kc2g.com/ .
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