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Solar Eclipse 2009

July 22, 2009, I woke up early in the morning to join a group of astronomers in observing the longest solar eclipse of our lifetime. 14.62 degrees latitude, 121.10 longitude is the location of the site where we took photos of Luna passing in front of Sol.


The group is consist of member of the University if the Philippines Astronomical Society and some Instructor at the Astronomy department of Rizal Technological university. We photos of the eclipse using Bamm Gabriana’s 10” MEADE reflector together with point and shoot digital cameras. We used combinations of 4 solar filters including red and yellow eyepiece filters to get this results.

We can only see partial solar eclipse from Manila, this is why most of the professional astronomers in the Philippines flew to China to get a chance to take a shot of the longest total solar eclipse.


I took this photo @ exactly 9:44 AM Manila time which is one minute after the Maximum occultation. I also took a photo of the final egress just seconds before the eclipse end (photo below).


This was taken @ around 10:58 AM Manila time.

At the very same time the group of Filipino astronomers back in China experienced the totality as seen in the video below. Although they were not able to take photos as the clouds did not favor them, the totality experience alone is worth going to China.

I enjoyed the day as I was able to witness a remarkable astronomical event which reminds us of how small we are and how marvelous God is (if there is really God).



DIY Airsoft Chrono [PC-based]

Chrono or Chronograph, the term used by Airsofter and Paintball players to refer to the device that measures the muzzle velocity of firearms. This is also called MVMD, short for Muzzle Velocity Measuring Device by the British Army. Muzzle Velocity is the velocity of the bullet as it exits the barrel of the firearm.

A year ago I was an active Airsofter in Iligan who's more interested in modifying and improvising AEGs (Automatic Electric Gun) rather than playing airsoft. I have made my AEG susceptible to high current burns by using locally available MOSFETs. I have improved velocity by replacing cylinder gaskets and spring. I have increased the rounds per minute by altering the armature windings of the drive motor. And most of all, I have made my own cheap alternative PC-based Chrono.

I have posted an artivle before that details the development of my chrono but unfortunately the online forum was hacked/deleted by webmaster of due to some violation in the contents. So, …

Disable PrintScreen on C# without Keyboard Hooks

Yes, there is a simple solution to prevent grabbing information on your C# application screen with the keyboard's printscreen key without using keyboard hooks or calling COM interops. The solution makes use of Windows Forms Message Filter to trap keyboard events on your application window.

To trap keyboard events with Windows Message Filter, you need to implement the IMessageFilter interface and override the member PreFilterMessage(ref Message WM) method. This is the method called whenever a Form receives a keyboard or mouse event. You may want to read more about IMessageFilter.

The problem is that even though you have trapped the PrintScreen keypress event, the captured image will still persist to the clipboard. Therefore the simplest solution is to clear up the clipboard right after the PrintScreen is pressed on the keyboard.

This is how the overridden method will look like this:

publicbool PreFilterMessage(refMessage WM)
Keys kCode = (Keys)…

DIY Mic Shock Mount

For the past couple of weeks I was looking for a cheap microphone shock mount and the cheapest I saw that was available in my country was around US$160 so I decided to build a cheap one. I only spent less than $6 and a 2 hours of my not very precious time.Before I left office today, bought materials and tools to for my DIY shock mount which are a piece of 4”-diameter PVC pipe coupling ($0.50), a set of hair ties($0.40), set of stove bolts ($0.50), a set of coping saw frame and blades ($2.5).First, I decided to cut the PVC coupling so it would look like Rode SM3 shock mount’s frame.Then I used the section of the PVC coupling that was removed to be a attachment brace to the original mic holders base and bolted it to the base of the frame. I had to heat that part so could bend it to a desired angle.And then cut slots on the edges for the rubber suspensions (hair ties). Right after positioning the suspensions, i found a problem. The rubber bands slip every time i attempted to position the…