It is plausible that Namo had a foreknowledge that lights would be derived from the Trees and placed in the sky. However, I think that:
And now, for FUN WITH MATH:
The real moon and sun have the same apparent size in the sky because, although the sun is 400 times as wide, it's also 400 times farther away. So the Sun in Arda can be the same size and distance as the Moon. If the Moon and Sun have the same apparent size as in real life:
If they're as high as the top of the stratosphere (above the ozone layer in real life) at 50 km, then they have diameters of 452 meters.
If they're as high as the top of the troposphere (maybe equivalent to the top of Ilmen?) at ~17 km, their diameters are 154 meters each.
If they're lower than that (maybe in the middle of Ilmen, or perhaps only as high as Taniquetil's peak) they can be smaller. Everest is 8.8 km tall, and Taniquetil must be taller. So at 10 km altitude, they would have diameters of 90 meters each.
But in any case, either they must be HUGE or very close, yet they shouldn't be much lower than Taniquetil's peak.
Now, the Flower and Fruit themselves might not be quite so huge. Their light might be contained and spread out in larger, spherical or hemispherical lamp-vessels. And we of course do not need to decide on specific numbers. But they should be enormous.
- Yavanna didn't have such foreknowlege, she only hoped for some kind of light for Middle-earth.
- Melkor and Ungoliante darkening Valinor was a free-willed action.
- If the Darkening hadn't happened, the Valar could still have decided to (and in fact, upon Mandos' words decided not to) put similar lights in the sky, anyway.
- The Sun and Moon aren't all that pertinant to Namo's domain. But I could be talked into it.
- Solar eclipses, in particular, are caused by Tilion getting far too close to Sun, which is both free-willed by him and definitely not the Valar's plan.
And now, for FUN WITH MATH:
The real moon and sun have the same apparent size in the sky because, although the sun is 400 times as wide, it's also 400 times farther away. So the Sun in Arda can be the same size and distance as the Moon. If the Moon and Sun have the same apparent size as in real life:
If they're as high as the top of the stratosphere (above the ozone layer in real life) at 50 km, then they have diameters of 452 meters.
If they're as high as the top of the troposphere (maybe equivalent to the top of Ilmen?) at ~17 km, their diameters are 154 meters each.
If they're lower than that (maybe in the middle of Ilmen, or perhaps only as high as Taniquetil's peak) they can be smaller. Everest is 8.8 km tall, and Taniquetil must be taller. So at 10 km altitude, they would have diameters of 90 meters each.
But in any case, either they must be HUGE or very close, yet they shouldn't be much lower than Taniquetil's peak.
Now, the Flower and Fruit themselves might not be quite so huge. Their light might be contained and spread out in larger, spherical or hemispherical lamp-vessels. And we of course do not need to decide on specific numbers. But they should be enormous.
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