I'm glad to see most of the tour companies that visit the summit of Mauna Kea are staying longer after sunset than I remembering them doing in the past. Although the sunset is always beautiful (as long as it's not foggy) the best colours appear in the sky well after the sun has disappeared, often ten to fifteen minutes afterwards. It's great that the visitors have a chance to experience the sky at this time and some of the things I overheard this evening were good to hear, such as "this was the best trip I've ever been on!". It was helped, of course, by having very light winds and reasonably mild temperatures for this time of year (about 2 Celsius or about 36 degrees Fahrenheit).
We can't start observing until about 30 minutes or so after sunset since the sky is still too bright to find our guide stars so I have a little free time to take some pictures. Above is the sky in the west well after the sun had set. The colours were tremendous, deep red on the horizon, bright yellow above, some pink/orange stuff high up (Gobi Desert dust?) and then a deep blue overhead. The two peaks are Haleakala to the left and Pu`u Poli`ahu to the right. Below, to the south, Mauna Loa with some clouds being driven well over the saddle towards the leeward side of the island.