Cost Advantage. Collective trusts can operate with lower compliance costs than mutual funds for two reasons. First, because the institution is offering the investment to a large number of employees, they can negotiate a lower cost due to the higher supply of money they are providing.
You can absolutely see the earth's curvature if you're at altitude, particularly over the ocean in a plane. At sea level, you can only see about 3 miles. The average angle of human vision is somewhere between 120Âº and 140Âº; more if you count the whole image your brain builds up as your eyes move. The curvature of the horizon can be found with:
And in order to see all that earth through a view port of diameter $d$, you need to be closer than distance $L$ from the outer part of the view port, so $$L < \frac{d}{2\tan\theta}$$ It should be clear from this diagram that you never even see half the earth - and that being close to the view port is essential to see enough. If the need is to see all of earth within a 135Â° view angle ($2\theta$ in the diagram) then we can obtain $h$ from $$(R+h) \sin(\frac{135}{2}) = R\\ h = R(\frac{1}{\sin 67.5} - 1) = 0.082 R = 525 km$$