Night Diving and Cave Peering
581329
This light is bright, waterproof and lasts for a long time.  My wife and I bought one each for our advanced certification [there is a required night dive] and we rented our torches.  Right our the box you can feel the quality in this light.  The business end screws on reassuringly, with a user replaceable silicon (?) gasket.  If you do not own gasket lubrication, pick some up - your o-rings will last longer that way.  The LED assembly is held in by pressure from the cap and the housing itself.  Once the cap is unscrewed, it will fall out of the light if you are not careful.  Takes standard AA batteries.  The switch feels like a possibly point of failure in the light, but I am careful with my stuff and have not noticed a loosening on it over its many uses.  Turning it left or right will turn on the beam.  No brightness adjustment.
The reasons for the 5 stars are:
The price.  For what you get, this is one of the brightest, least expensive dive lights out there
It's yellow [I know black is fashionable, but you won't think that way if you drop it]
Comes with a simple lanyard
On standard AA's, I haven't had it run out of juice or overheat [admittedly I replace the batteries before each trip to be safe]
Some things to note:
This produces a fairly narrow beam of light.  It will over-saturate a GoPro or other camera due to the brightness being focused on your target.  I have done (2) things to combat this.  The first was to shine the light off target of what I was looking at with the camera.  Works fine, but you still have a super-bright spot in your videos - but at least you can see your target.  The second thing I tried, and worked shockingly well, was to use my wife's hairband and a piece of white grocery bag and make a diffuser for the light.  The downside to that method is I had to rely on my wife's light for illumination further than 10 feet in clear water.  This is not good diving practice, though I could have removed the diffuser at any moment.  The videos turned out really well though!
396487
I received my copy of Diving Bali : The Underwater Jewel of Southeast Asia (Periplus Action Guides)yesterday, and lost a good night's sleep reading it.  My only regret in buying this book is that I didn't get it before going diving in Bali last summer.  The pictures are outstanding and the  maps are of a very high quality.  I think I'll be cancelling my diving trip  to the Philippines in July and returning to Bali instead!
1517859
I have a well used, copy of this book that I find essential while planning a nights viewing session; I also keep it next to my telescope when observing. As the title suggests, only deep sky objects such as nebulas and galaxies are covered. Objects like the moon and planets are "shallow sky" objects and aren't listed. Most of the objects are probably visible in telescopes of medium size from dark sky locations.

This book is divided into 3 main portions. The first briefly covers various types of objects, and equipment and techniques to observe them. The next part lists constellations seasonally. Deep sky objects are listed along with  descriptions and star-hopping methods for locating them. The last part is a Mag 6 star atlas, with all the listed objects shown.

One of the other reviewers bemoaned that the descriptions don't mention the pages they appear in the atlas. I agree it would be a nice touch, and is the one thing that I'd wish for.

In my case, I've scribbled notes and underlined portions of text.

Despite this, I highly recommend this book. I find it one of the better beginner-intermediate selections in this field. It doesn't take up too much valuable space, but lists a number of objects both common and overlooked. I keep it with my charts, and it's one of a very select group of objects I keep with my telescope.
2676973
This Phootn light is very useful and handy. I've used it when exploring and being out at night. Good product!
2073460
"Secrets of the Night Sky" shows you the wonders there are all around us, and that go unnoticed most of the time. It depicts things with a sense of awe that arouses curiosity.
I bought this book because I thought it would tell me how to locate more things than a "A Walk Through the Heavens", which has maps and tells you how to locate stuff by going from one constellation to the next, and from star to star, and I was a little disappointed. This book seemed at first glance too colloquial, with not enough depth.
I have finished it now, and the best thing this book does is to show how a sunset is amazing, that the Red Spot is not red, why the moon looks bigger sometimes, why the moon looks crimson, how some planes tried to shoot down Venus (its very fun). Also, it explains how to recognize satellites, where to look for meteor showers, how to locate Mercury, Venus, Jupiter. It has a lot of basic information, but presented in an awe inspiring way.
This is the best companion book for "A Walk Through the Heavens". "A Walk" shows you how to locate stuff; "Secrets", why you should look for it.
3709884
Peeking into your reef has never been so easy. Check your on personal puddle without getting wet. Use a flashlight at night to see a different version of your tank life. Wonderful product.
1528415
This is certainly bright. It easily outshines my Cree 350 lms hand held light. At night it will really light up objects 400 feet away. I intended to use this light for caving and that is where the concerns start. The strap does stretch enough to fit over a helmet, so no problem there. However the switch is on the back of the battery pack which can make it awkward to operate the switch, especially with gloves on. It is even conceivable that in the tight confines of a cave the switch could be accidentally bumped. A switch on front of the light itself would be much more convenient.  The switch is 3 way: very bright, bright, and strobe. The other concern is the focus mechanism. The light can change its beam from a somewhat tight square to a wide angle by sliding the lens in or out. The slide mechanism is not a real tight fit and a sharp movement causes it to slide which changes the focus. An O ring in the mechanism would have prevented that.
367653
As a diver I am amazed with the sights of the underwater world.  This book takes some of these images and creates meaning.  It might be beauty, danger or mystery, but it is not just a picture.
159169
The Casio 200 meter WR Sea Analog Illuminator is a fine dive watch.  It has the required screw down crown and back, a curved crystal face to help with readability, SUPERB (and I mean SUPERB) illumination system and that also includes BEFORE you press the brilliant light button.  Very pleased.  The bezel is a bit tight but it seems to get better with use.
637882
this is not a high-performance device. yet to make a search of the surrounding area at night is pretty good. a little uncomfortable to focus. although I think that after getting used no problem at all. with natural light from the stars or moon does not need the infrared. After 55 yards I can not make out a face but certainly if a person or an animal
447936
This book is great for all stargazers. Geared more for kids, with it's cute illustrations and brief history recaps, but anyone will enjoy taking the book out into the dark and see the glow in the dark pages match the night sky. Easy to use. Highly recommend
2577569
I like the glow in the dark feature in this book, also the history behind the Constellation names is fun.
2137883
The descriptions of how to find things are extremely useful if your scope (or binoculars) doesn't have goto. Also, the curated list of things to look at is great for when you're bored with what you already know how to find.

Opens up flat and is readable at night with a red light.
2439079
This manual full of charts and maps of the different regions of the night sky is perhaps a bit dated with so many discoveries now in the outer rim of our universe.  It is perfect for a beginning star gazer out in the yard away from lights.  Justin and I could never find Halley's Comet because of the street lights in the small town.  To look at the sky, it is best to be out on a hill top away from all light.

At the Rochester, New York, Strasenburgh Planetarium, there is a 1968 star projector, a double-headed star ball, one end for the Southern Hemisphere, and the other for the Northern Hemisphere.  The ball is full of pinholes patterned after the positions of stars in the night sky with a mercury vapor light from incise the fall to create an accurate map of the stars in total darkness on the rounded ceiling of the dome.  It is computer-controlled.

Here, we have the Akima Planetarium which is even older, but fully functional; it has only one star ball which can be changed according to the season showing the different night sky. Mr. Ferguson explains where the known stars are located and gives a history of why and how the constellations got their names all the way back to antiquity.  He gives a good show for the children as well as the adults.  He always starts with the North Star and goes all the way around the dome with his interesting banter.  During the Fair, for ten days, he presented six shows a day in the Discovery Center located adjacent to the Fairgrounds.

If I were to suggest that you 'don't count your chickens before they're hatched' you might take it the wrong way. However, while it's worth reminding you not to go counting your chickens, it's not needed because they're not going to hatch. Those little chicks could well hatch exactly as you want them to. But there is another even better possibility. They may yet hatch in a way you hadn't even thought it that's preferable to the way you had expected. It's a week when anything could happen so allow a little room for the Universe to be creative.

Some years ago, it was my pleasure to visit the Adler Planetarium in Chicago with my astronomer son, Geoffrey.  As I recall, the oral program was all pre-recorded and on a much larger range than the Strasenburgh and Akima which are smaller.  There's nothing as fascinating as learning (in a fun way) about the planets (poor lost Pluto!), stars and shooting stars in our own universe.
2500324
We visited someone's house on a hill in the night for the first time. It could be hard to get there and return. It was hard to see anything in the dark. Totally depended on the GPS unit, the trip was an easy one.
2512869
Wish I had one. A cabin where you can see the stars at night.
3454619
A great aid for exploring the night sky.  I want to learn more about what's out there.  This will help.