Valian Year 1497

[Galin]

Under Grey Annals year 1497, in the section Of The Coming Of The Noldor:

'In this same year of the Valar (but some seven years after in the later reckoning of time) Feanor came over Sea in the white ships of the Teleri, and landed in the Firth of Drengist, and there burned the ships at Losgar.'

I might be wrong, but do folks disagree (or agree) that this means seven years into 'year' 1497 (using 1 Valian Year = 9.582 Sun Years here, not 144). According to these annals, in this year Morgoth first assaulted Beleriand, and the battles with the Orcs (death of Denethor of the Green Elves) take place. The Noldorin arrival is new tidings, as noted in the published Silmarillion (and Grey Annals), suggesting Feanor was not around until after these things occured in Beleriand.

If so, regarding the events as noted in Annals of Aman for the same year: there 'all' that seems to take place is the Noldor arrive at last into the far north of Arda (knowing that they were drawing nigh to the Helcaraxe) -- they halt and debate, but 'soon' began to suffer anguish from the cold and the clinging mists -- Feanor takes counsel with his sons, and they sieze the ships, sail -- and burn the ships at Losgar.

That doesn't seem like all that much, but again, do people agree that we have seven years from the beginning of the events noted in both Annals (Aman and Grey) under 1497 -- until Feanor lands in Middle-earth?

Or if not, what might be another interpretation of this passage?