First, the structure — Page 444, Lesson 415

I want to walk you through this table, because it's one of the most practical tools you'll use in navigation planning. This is a sunrise table for the months of April and May, and it's laid out by latitude. Let me show you exactly how to read it, because the format is dense but the logic is simple. First, the structure. The left-hand column is latitude, marked in degrees. You'll see "N" for north and "S" for south. So N 72 means 72 degrees north, N 60 is 60 degrees north, and so on down through N 50, N 20, N 10, then the equator at 0, then S 10 and S 30 for the southern hemisphere. The table gives sunrise times for each of these latitudes. Now the columns. The top row shows the months and days. We have April, with days 2, 5, 8, 11, 14, 17, 20, 23, 26, 29, then May with days 2, 5, 8, 11, 14, 17. Each day column is split into hours and minutes — that's the "h" and "m" at the top. So for any given latitude and date, you read across the row and down the column to get the time of sunrise in hours and minutes. Let me give you a concrete example. Take latitude N 60, on April 2. Reading across that row, the time is 05 hours 24 minutes. Now go to May 17 at the same latitude — that's 03 hours 19 minutes. You can see the pattern immediately: as spring progresses, sunrise gets earlier. At N 60, it drops from 05:24 in early April to 03:19 by mid-May. Now here's something important you'll notice in the table — the letter "G" appears in several places, particularly at the high northern latitudes. Look at N 72 and N 70. You'll see entries marked with G. That's a critical flag for you as a pilot. At very high latitudes in spring, the sun may not rise at all for part of the period — that's polar night transitioning into continuous daylight. The G marks those latitudes and dates where the normal sunrise pattern breaks down, where you're dealing with the sun being continuously above or below the horizon. When you're planning at those latitudes, you can't treat sunrise as a simple time — you have to account for the fact that the sun's behavior is fundamentally different. Let me also point out the southern hemisphere rows, because they work in the opposite direction. Look at S 30, April 2 — that's 06 hours 11 minutes. Now May 17 at S 30 — that's 06 hours 24 minutes. The times are getting later, not earlier. That's because it's autumn in the southern hemisphere during April and May, so days are shortening and sunrise is coming later. The table captures both hemispheres in one chart. One more thing to notice — the precision. These times are given to the minute, and that matters in navigation. When you're computing daylight available for a flight, or when you're planning an arrival before last light, a few minutes can be the difference between a legal approach and one that's pushing the limits. So you read this table carefully, interpolating between latitudes when your position falls between the listed rows. That's the whole tool. It's a latitude-and-date grid that gives you sunrise to the minute, with the G flag warning you about the special high-latitude cases where the sun's behavior changes character entirely.