The same concepts that apply for the moon apply for the sun, yet, the sun has a
smaller effect on the water levels but when that can only contribute or lessen the
effect of the moons gravitational power. This is described by "spring tides" where the
lunar tide and solar tide are aligned and contribute to each other and by "neap tides"
where the lunar and solar tides are at right angles of each other and lessen each other.
This is shown in Fig 2.