The diurnal inequality of the tides is...

🔍 Key Concepts

• Diurnal inequality – what it means in terms of one high tide vs the other high tide in the same day • The difference between the Moon’s distance from Earth (perigee/apogee) and the Moon’s tilt relative to Earth’s equator (declination) • Which tidal characteristics are affected by gravitational strength vs. geometry/angle of the tide‑raising forces

💭 Think About

• Ask yourself: does diurnal inequality depend more on how strong the Moon’s pull is, or on the angle at which that pull acts relative to Earth’s equator? • Consider which options (perigee, apogee, weather, declination) would change the overall height of both tides together, and which would make one daily tide higher than the other. • Think about how often diurnal inequality patterns repeat: are they linked to short‑term weather systems, the Moon’s orbit distance cycle, or the slower change in the Moon’s position north/south of the equator?

✅ Before You Answer

• Be clear on the definition of perigee (Moon closest to Earth) and apogee (Moon farthest from Earth) and what they mainly affect. • Confirm that weather can cause irregularities in observed water levels but is it the primary cause of the regular pattern called diurnal inequality? • Identify which choice directly relates to the Moon’s north–south position relative to Earth’s equator, since that is tied to unequal daily tides.

The diurnal inequality of the tides is caused by __________.

the declination of the Moon

the Moon being at perigee

changing weather conditions

the Moon being at apogee

🔍 Key Concepts

💭 Think About

✅ Before You Answer