From the article:
"Owing to various view angles from different parts of the Earth, the most ambitious jet-setting astronomer could have seen a maximum of 59 percent of the surface of our planetary companion. "
If we take into account that fact that Earth is not a point, then epsilon is not so tiny after all, it's around 0.045 times circunference.
This would make the final result 0.455 times circunference.
If we take into account that fact that Earth is not a point, then epsilon is not so tiny after all, it's around 0.045 times circunference.
This would make the final result 0.455 times circunference.