Years ago I made an observation that an earthquake would happen based on a near earth object. It ended up being the one in Chile. I do wonder if there's some kind of correlation considering that green comet is flying by
The sun completely dominates all other bodies in the solar system when it comes to gravitational effects on Earth (even the moon has less of an effect than the sun, despite its proximity). The Earth doesn't even notice this comet's existence, gravitationally speaking.
The Gradient between the gravitational forces on different parts of the earth is larger for the moon though, as you can see by the tides. I would assume this would have a bigger effect than the total force. But you are right, a comet or asteroid isn’t going to do anything.
The sun completely dominates all other bodies in the solar system when it comes to gravitational effects on Earth (even the moon has less of an effect than the sun, despite its proximity). The Earth doesn't even notice this comet's existence, gravitationally speaking.