

I recently rewatched virtually the entire Toho kaiju filmography. To make things interesting, I decided to try to make a chronological history of the different series.
Here's my Showa Era timeline:
https://edquitssmoking.blogspot.com/2021/04/tohos-godzilla-universe-showa-era.html
And here's my Heisei Era timeline:
https://edquitssmoking.blogspot.com/2021/04/tohos-godzilla-universe-heisei-era.html
I'll probably do one more for the modern era...
The Showa Era films I covered are:
Godzilla (1954)
The Invisible Avenger (1954)
Godzilla Raids Again (1955)
Half Human (1955)
Rodan (1956)
The Mysterians (1957)
The H-Man (1958)
Varan (1958)
Battle In Outer Space (1959)
The Secret of the Telegian (1960)
The Human Vapour (1960)
Mothra (1961)
The Last War (1961)
Gorath (1962)
King Kong vs Godzilla (1962)
Attack of the Mushroom People (1963)
Atragon (1963)
Godzilla vs the Thing (1964)
Dogora (1964)
Ghidorah the Three Headed Monster (1964)
Frankenstein Conquers the World (1965)
Monster Zero/Invasion of Astro-Monster (1965)
War of the Gargantuas (1966)
Godzilla vs the Sea Monster (1966)
King Kong Escapes (1967)
Son of Godzilla (1967)
Destroy All Monsters (1968)
Latitude Zero (1969)
Space Amoeba (1970)
Godzilla vs the Smog Monster (1971)
Godzilla vs Gigan (1972)
Godzilla vs Megalon (1973)
Tidal Wave (1973)
Godzilla vs Mechagodzilla (1974)
Prophecies of Nostradamus (1974)
ESPY (1974)
Terror of Mechagodzilla (1975)
The War In Space (1977)
I hope I didn't leave anything important out!

I can barely see it

Sorry, I have no idea why this page did that. Here it is again:
The Showa Era films I covered are:
Godzilla (1954)
The Invisible Avenger (1954)
Godzilla Raids Again (1955)
Half Human (1955)
Rodan (1956)
The Mysterians (1957)
The H-Man (1958)
Varan (1958)
Battle In Outer Space (1959)
The Secret of the Telegian (1960)
The Human Vapour (1960)
Mothra (1961)
The Last War (1961)
Gorath (1962)
King Kong vs Godzilla (1962)
Attack of the Mushroom People (1963)
Atragon (1963)
Godzilla vs the Thing (1964)
Dogora (1964)
Ghidorah the Three Headed Monster (1964)
Frankenstein Conquers the World (1965)
Monster Zero/Invasion of Astro-Monster (1965)
War of the Gargantuas (1966)
Godzilla vs the Sea Monster (1966)
King Kong Escapes (1967)
Son of Godzilla (1967)
Destroy All Monsters (1968)
Latitude Zero (1969)
Space Amoeba (1970)
Godzilla vs the Smog Monster (1971)
Godzilla vs Gigan (1972)
Godzilla vs Megalon (1973)
Tidal Wave (1973)
Godzilla vs Mechagodzilla (1974)
Prophecies of Nostradamus (1974)
ESPY (1974)
Terror of Mechagodzilla (1975)
The War In Space (1977)
I hope I didn't leave anything important out!

Is Tidal wave part of it?

And destroy all monsters is set in 1999

Since the moon was destroyed in "Gorath", I slotted DaM as "before 1979". We need the moon for DaM and in my version it just says DaM takes place at the end of the century. I took as few liberties as possible...

I don’t agree... but okie.

That's a big list of movies. I only have the Criterion collection

In addition to the Showa and Heisei film chronologies mentioned above, I completed something for the Millennium series. Naturally, since these were all reboots it ended up as 10 films split over 7 chronologies...
Still, it was a fun exercise to do try and make sense of all this.
https://edquitssmoking.blogspot.com/2021/04/tohos-godzilla-universe-modern-era.html

To me it seems that the 1999 detail is too big to ignore, I would rather change Gorath to be later, or earth got a new moon.

According to supplementary materials some version of the events from Gorath took place in the Kiryu Saga--But that's an issue since you plainly see the moon in Godzilla x MechaGodzilla.
Additionally, the Kiryu Saga supplements claim Maguma appeared in 1962, when the events of Gorath don't even start until 1976.
It's possible it's only referring to the monster in that timeline though. EdCh, I noticed this was left out of your continuum splits.
Another thing I noticed is the events of GMK actually take place in 2004.

Thanks for your feedback SarcasticGoji and G. H. (Gman). I may switch around a few things. I always thought that DaM took place at 1999 also but couldn't figure out how to get it there with the Gorath moon problem. Maybe I can pretend the DaM moon is a moon of Mars?
I totally forgot to reference the printed material with the Kiryu movies - I knew I left something to do! I'll take a look at that and maybe mention that as a footnote.
Thanks for the GMK correction.