Which one is correct? 1 or 2?

[NewHopeR]

1) One celestial body obscures another - this phenomenon is referred to eclipse.
2) One celestial body obscures another - this phenomenon refers to eclipse.

[emsr2d2]

1) One celestial body obscures another - this phenomenon is referred to eclipse.
2) One celestial body obscures another - this phenomenon refers to eclipse.

Neither.

When one celestial body obscures another, the phenomenon is referred to as an eclipse.

[BrunaBC]

Neither.

When one celestial body obscures another, the phenomenon is referred to as an eclipse.

Hi emsr2d2!

Your sentence is in the passive voice, right?
What about this sentence, is it ok as well? (I prefer your sentence, and that's how I'd say it, but I just want to check if this other way is also possible grammatically)

"The phenomenon when one celestial body obscures another refers to an eclipse."

[SoothingDave]

Hi emsr2d2!

Your sentence is in the passive voice, right?
What about this sentence, is it ok as well? (I prefer your sentence, and that's how I'd say it, but I just want to check if this other way is also possible grammatically)

"The phenomenon when one celestial body obscures another refers to an eclipse."

No, the phenomenon is not referring to an eclipse.

[emsr2d2]

Hi emsr2d2!

Your sentence is in the passive voice, right?
What about this sentence, is it ok as well? (I prefer your sentence, and that's how I'd say it, but I just want to check if this other way is also possible grammatically)

"The phenomenon when one celestial body obscures another refers to an eclipse."

No. If you want to use it in the active you would say "The word eclipse refers to the phenomenon when one celestial body obscures another."

[BrunaBC]

Ok, I see it, but why can't I say 'The (without the word) eclipse refers to the phenomenon when one celestial bosy obscures another'.?

[emsr2d2]

Because "The eclipse" does not refer to anything. The word refers to the phenomenon.

[BrunaBC]

I get your point. Sorry for being insistent, but is this sentence fine then?

"The eclispe is the phenomenon when one celestial body obscures another"

[bhaisahab]

I get your point. Sorry for being insistent, but is this sentence fine then?

"The eclispe is the phenomenon when one celestial body obscures another"

No. "An eclipse is a phenomenon during which one celestial body obscures another."

[BrunaBC]

Thank you all. Now it's clear and I've clearly noticed my mistakes.