[Avodah] Rakia, maasei bereishis, halacha

[D&E-H Bannett]

Just an odd thought:

Are the borders of the hatzeir parallel to one another as 
they go up to the raki'a? That is, are all cross-sections of 
the hatzeir identical in size at all heights? Or perhaps, 
the borders are found by drawing lines from the center of 
the earth, in which case the hatzeir cross-section increases 
in size as we go higher.

In other words, is the earth flat or a big ball?


David