Weight dependency on the location on Earth relative to Sun In this post a theoretical physicist says that one will weigh less at the point on the Earth closest to the Sun due to the Sun's gravity, which makes sense to me. But he also says that one will weigh less at the point on the Earth farthest from the Sun. This doesn't make sense to me, because I imagine that in this case the gravity of the Sun should add to the gravity of the Earth making one heavier. Is this correct or no?
 A: 
This doesn't make sense to me, because I imagine that in this case the
gravity of the Sun should add to the gravity of the Earth making one
heavier

What he means is that when one is at the point farthest from the sun, it also means that earth is closer to the sun than the person. So, the sun will pull  on earth more than it pulls on the person. So, the person will be accelerated toward the sun slower than the earth is. The result is that he will be slightly lighter
A: This is how tidal forces work, and why the tidal bulge appears on both the near and far sides of the body simultaneously.
Intuitive explanation--the Earth's center of gravity is in a weightless orbital path around the sun.
If you're on the noon side, your orbital velocity is slightly too slow for your orbital path (as you are traveling at about the same speed as the Earth's CG, but in a smaller ellipse).  Therefore, you have a slight tendency to fall toward the sun, away from Earth, with the end result that you're slightly lighter.
If you're on the midnight side, your orbital speed is slightly too high for your orbital path, and you tend to be pulled away from the both the sun and Earth.  Again, slightly lighter.
This analysis doesn't take into account the rotation of the Earth.  Earth's orbital velocity, at about 30km/s, has more effect than its surface speed, <0.1km/s.
A: After doing a little research, I believe that the gravity being weaker on the opposite side of the Sun is because of the earth being pulled towards the Sun more (by product of being closer) than a person standing on the earth's surface at midnight on the equator. Does this help?
