Answer:
measure the parallax and use it in calculations
Step-by-step explanation:
The best method to calculate the approximate distance of a star from Earth based on observations from two positions in Earth's orbit (summer and winter) is to measure the parallax and use it in calculations. Parallax is the apparent shift in the position of a nearby object when viewed from different perspectives, and it is commonly used in astronomy to determine the distance to stars.
Therefore, the correct option is:
measure the parallax and use it in calculations