🔍 Key Concepts

• Relationship between degrees of arc and time on the earth’s rotation • Conversion of degrees to minutes of time using 15° per hour • Breaking 2° 35' into degrees and minutes, then converting step-by-step

💭 Think About

• How many minutes of time does 1° of longitude (or hour angle) represent, given that 15° equals 1 hour? • First convert 2° to time, then convert 35' to a fraction of a degree and then to time—are you keeping units straight at each step? • After you get a total number of minutes of time, how do you convert the decimal part of a minute into seconds?

✅ Before You Answer

• Be sure you are using 15° = 1 hour = 60 minutes of time, not 60 nautical miles per degree • Convert 35' to decimal degrees before turning it into time; don’t mix arc minutes with time minutes • After you find time in decimal minutes, convert the fractional minute × 60 to get seconds and compare carefully with the choices