Let me orient you to the structure — Page 455, Lesson 449

I want to walk you through what this page actually is, because at first glance it looks like a wall of numbers. This is a Sunset Table — a standard page from the General Navigation manual that gives you the time of sunset at various latitudes for each day of the year. It's a tool you'll use in real flight planning, particularly for calculating night flying conditions and for working with twilight problems. Let me orient you to the structure. The table is organised by latitude, running down the left-hand side from N72 degrees down to N54 degrees. The columns across the top are the dates — and here we're looking at the months of November, December, and January, with the days listed as 19, 22, 25, 28, then 1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31, and then 3. So you read it like this: pick your latitude, go across to your date, and the number you find is the time of sunset in hours and minutes — the header row shows the units as h for hours and m for minutes. Now, the key thing to understand is the pattern in the numbers, because that's what makes this table useful. Look at the N60 row, for example. On the 19th of November, sunset is at 15 hours 23 minutes. As you move through late November into December, the times get earlier — 15 18, 15 12, 15 08, 15 03, 15 00, 14 57, 14 55, 14 54, 14 53, 14 53 — and they bottom out around 14 hours 53 minutes in mid-December. Then, after the winter solstice, the times start getting later again: 14 55, 14 57, 14 59, 15 03, 15 07. That's the seasonal rhythm — shortest days in December, then the days lengthen again into January. You'll also notice the latitude effect. Compare the same date across different latitudes. At N72, the table shows mostly blank cells — the symbol you see there, the little circle, indicates that the sun doesn't set at all on those dates; that's the polar day phenomenon at high latitudes. At N68, you start seeing entries like 14 00, 13 47, 13 33, 13 19, 13 04, 12 47, 12 27 — and then blanks again. The further north you go, the earlier the sunset times become, and the longer the period of continuous daylight or continuous darkness. Let me give you a few concrete readings so you can see how to pull data from this. At N64 on the 19th of November, sunset is at 14 hours 51 minutes. At N62 on the 1st of December, it's 14 hours 45 minutes. At N58 on the 28th of November, it's 15 hours 12 minutes. And at N54 on the 31st of December, it's 15 hours 56 minutes. Each of those is a sunset time you could read straight off the table for a flight planning calculation. One more thing to notice — the times aren't perfectly smooth. Look at the N56 row: 15 46, 15 42, 15 38, 15 35, 15 32, 15 29, 15 27, 15 26, 15 25, 15 25, 15 26, 15 27, 15 29, 15 31, 15 34, 15 38. The minimum sits around 15 hours 25 minutes in mid-December, and the values are symmetric around that minimum — they decrease to it and then increase away from it. That symmetry is the signature of the solstice, and it's exactly the kind of pattern you'd expect from the Earth's axial tilt. So, to summarise what this page gives you: a sunset time table organised by latitude and date, covering November, December, and January, with times in hours and minutes, showing earlier sunsets at higher latitudes, the seasonal minimum around mid-December, and blank cells at the highest latitudes where the sun never sets. That's the complete picture of this table.