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It's the only way to be sure
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this post was submitted on 05 Sep 2023
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Maybe I'm stupid but I don't see how you could safely cast it. Even if you cast it all the way back at the edge of the range you still would be inside the radius.
You target something 150 ft away, and it reaches 93 ft towards you before dying out
The radius is the size of the sphere as measured from the center of the explosion.
Maybe this analogy helps.
You throw a ball at a wall and it bounces back towards you. If the ball reaches you or passes you then you die.
You can throw a ball (the fireball) 150ft. At the end of your throw it hits a wall (center of explosion). The ball bounces back towards you 92.832ft (explosion radius/edge of explosion). The ball is now 57.168 ft away from you. Ball did not reach you therefore you live.
First, of course, we must use the wish spell to make the room 150ft long with the alter at the other side.
If you cast it so that it’s point of origin is 150ft away from you, then it would expand both 93ft towards you and 93ft away from you. By expanding 93ft towards you, there’d still be a gap of 57ft between you and the edge of the fireball. The farthest point edge of the fireball would be 243ft away.
But the volume fills the room. If the altar is against a wall, most of the fire blasting away from you would hit the wall and start coming back.