Answer:
The context clue in this passage has to do with the mention of the cardinal directions. The narrator mentions that it is difficult to calculate the east and west positions which we read at the end are longitude.
Explanation:
The passage then says that it is easy to calculate latitude by using the position of the sun above the horizon at midday. The passage goes on to clarify that this is the distance north or south of the equator.
<span>Flash'd all their sabres bare,
Flash'd as they turn'd in air
Sabring the gunners there,
Charging an army, while 30
All the world wonder'd:
Plunged in the battery-smoke
Right thro' the line they broke;
Cossack and Russian
Reel'd from the sabre-stroke 35
Shatter'd and sunder'd.
Then they rode back, but not
Not the six hundred. </span>
