Even at the Dark Polar Caps the Sabbath Can be Kept

 But the seventh day is the sabbath of the LORD thy God: Exodus 20:10

"The wisdom of God has given to our earth a globular form, and has
caused it to revolve upon its axis. 

So far is this from presenting any real difficulty in the way of those who keep the definite seventh day, it is actually that without which such observance would be impossible. 

--For if our earth stood still, one side would have perpetual day, and the other side unending night. There could be in that case no succession of day and night, and no such thing as a seventh day. 

--But by the divine arrangement of a revolving globular world, the definite seventh day comes to all the inhabitants of the earth, and they can observe it, if they have a heart to obey God. 

--Even the dwellers within the polar circles, where for a season it is all night, and for another season all day, can readily determine the revolution of the earth upon its axis, and can, if they are so disposed, observe the Sabbath of the Lord." 

J.N. Andrews