Looking south , the observer measured the shadow at noon ; looking north during the night , he measured the times at which the various circumpolar made their upper and lower transits across the meridian .
Features and spatial distributions of circumpolar deep water in the southern indian ocean and effects of antarctic circumpolar current .
南印度洋绕极深层水的性质和空间分布以及南极绕极流的作用。
The antarctic circumpolar current in this area is wind-induced and is also forced by density field .
该海区的南极绕极流既是风生的,也受到密度场的影响。
The common old world fox ; having reddish-brown fur ; commonly considered a single circumpolar species .
东半球普通的狐狸;红褐色的皮毛;一般被认为是极地地区单一的品种。
Their astronomical system was thus closely associated with the concept of the meridian ( the great circle of the celestial sphere passing through the pole star and the observer 's zenith ) , and they determined systematically the culminations and lower transits ( meridian passages ) of these circumpolar stars .
Here was the real essence of the hun thien theory discussed above ; once having gained a clear understanding of the diurnal revolution of the heavens , then the culminations and lower transits of the circumpolar stars would fix the position of every point on the celestial equator .
Scientists have hypothesized that the modified circumpolar deep water is the engine behind the blooms , stirring up just the right mix of trace metals and minerals from the deep to sustain plankton growth .
At the latitude of the pemaquid point lighthouse , approximately 44 degrees north , all stars having a declination greater than 46 degrees ( stars at the top left of the photo ) would be circumpolar -- they never rise and set but are above the horizon throughout the year .
That 's because of a clockwise current of water called the antarctic circumpolar current .
这是由于被称为南极绕极环流的顺时针环流造成的。
" All inuit from russia , alaska , canada , and greenland are standing in solidarity against the eu on this , " said ford , vice-president of international affairs at the inuit circumpolar council in canada .