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गला भर आना एक प्रचलित लोकोक्ति अथवा हिन्दी मुहावरा है। अर्थ- भावातिरेक के कारण गले आवाज़ न निकलना। प्रयोग- हाय समृद्धि की रानी रूप की लक्ष्मी, शोभा की स्रोतस्विनी, अनुराग की तरंगिणी, मंजुला की आज यह दशा! उनका गला भर आया।
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Only disadvantages, unless you're launching in a retrograde orbit, I'm afraid. And no, angular velocity at the dead center to the axis of rotation (i.e. true axial poles the Earth spins around, not magnetic poles) wouldn't play a role, as there is no angular velocity to speak of. Unless you count no angular velocity as one, of course. Out of my head (I might add a few other points, or describe the ones I'll make better, at a later date tho):
Gravity is at the poles slightly bigger than the Earth's average surface gravity because of the centrifugal force slightly negating its effect elsewhere, and the most of course at the equator (up to 0.3%), so you'll need more thrust to lift payloads of the same mass. This might not seem much, but it will once you'll have to lower expectations of your clients by up to that amount. Constantly working against margins of error also means this small percentage can fast cascade into a more substantial one.
No Earth's rotation assist, buying you roughly 1,670 kilometers (1,038 miles) per hour of free velocity at the equator (the radial velocity at which the Earth rotates around its axis there). This is a rough estimate, assuming the Earth was a perfect sphere tho. It isn't and the advantage to the equatorial launches should be even slightly bigger. Prograde launches use this to their advantage for a slight, but important assistance of the Earth's rotation and slightly less atmospheric drag. I.e. your initial velocity relative to the surface is already something, compared to nothing, and you don't get a benefit of moving in the direction the atmosphere rotates (this is blatant oversimplification though, it really depends on many more factors, but on average, it's true).
Faster exposure to the solar radiation because of the Earth's magnetosphere being the weakest there (and somewhat also at the South Atlantic Anomaly). This might or might not matter though, depending on the tolerance of your onboard and launch equipment.
It's freezing cold to say the least, which doesn't really help with your work conditions, but it might help keep the pressure in the cryogenic stages a bit more stable. It might. Some of the onboard equipment might also not be expected to work properly during and/or after such atmospheric conditions, if they need active heating by the onboard energy source (which might not be on at the time of the launch operations). Some propellants are also highly cryogenic with exposure to the air in the atmosphere, like e.g. liquid hydrogen (which is already stored in cryogenic temperatures), so subsequently more ice can form on your launch vehicle and cause damage to it (e.g. think - STS Columbia).
You're launching in the direction more or less perpendicular to the position of pretty much anything of interest in the Solar system, so you'll possibly want to adjust your vector later on anyway. And if you're launching a communications satellite, you'll probably still want to later position it over some population, which tends not to be as dense near true poles.
Awful weather conditions. You should be prepared to scrub your launch and have a possibly long wait for better conditions due to rough winds, blizzards
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