What happens when a planet travels close to the foci where the sun is located?

When a planet travels close to the foci of its elliptical orbit, where the Sun is located at one of the foci, it experiences an increase in gravitational attraction. This results in the planet moving faster due to the conservation of angular momentum, leading to shorter orbital periods. As the planet approaches the Sun, it also receives more solar energy, which can affect its atmosphere and surface conditions, potentially resulting in seasonal changes.