🔍 Key Concepts

• Standard vs. Daylight Saving Time (DST) and how to convert to the reference time used in tide tables • Using tide tables for Port Wentworth, GA for the correct date and finding the nearest high and low waters around 1840 • Applying time interpolation (rule of twelfths or table method) between high and low water to estimate height at an intermediate time

💭 Think About

• What time should you use in the tide tables after converting 1840 DST (ZD +4) to the local standard time used in the tables? • Once you find the bracketing high and low (or low and high) tides, how much time has elapsed between the earlier tide and 1840, and what fraction of the total interval is that? • Given that fraction of time between the two tides, how much of the total height difference would you expect at 1840?

✅ Before You Answer

• Confirm you used the correct time conversion from DST to standard time before entering the tables • Verify you are using the right day, port, and year (Port Wentworth, GA, 5 October 1983) in the tables, not the reference port or another date • Double-check the interpolated height: compare your result with the answer choices and see which is closest without rounding too early in your calculation