shooting night sky photos with nikon d3300
How do I get started in Astrophotography?
I am using PHP with Apache on Linux, with Sendmail. I use the PHP  function. The email is sent, but the envelope has the Apache_user@localhostname in MAIL FROM (example nobody@conniptin.internal) and some remote mail servers reject this because the domain doesn't exist (obviously). Using mail, can I force it to change the envelope MAIL FROM?  EDIT: If I add a header in the fourth field of the mail() function, that changes the From field in the headers of the body of the message, and DOES NOT change the envelope MAIL FROM.  I can force it by spawning sendmail with sendmail -t -odb -oi -frealname@realhost and piping the email contents to it. Is this a better approach?  Is there a better, simpler, more PHP appropriate way of doing this?  EDIT: The bottom line is I should have RTM. Thanks for the answers folks, the fifth parameter works and all is well. Why is the derivative of a circle's area its perimeter (and similarly for spheres)? Logic Behind StackOverflow Question IDs How to combine multiple conditions to subset a data-frame using "OR"? The reminder email says:     We noticed you have not accepted our invitation to join Stack Overflow Careers. Only 3 days remain before it expires [...]      But please act soon: this invitation expires in 14 days [...]   Is it 3 days or 14 days now? $f$ is surjective iff it has a right inverse: using the axiom of choice and errors in ProofWiki How can I recover files from partitioned disk? Please check my simplification for x? Are C-style macro names subject to the same naming rules as identifiers?  After a compiler upgrade, it is now emitting this warning for a legacy application:  warning #3649-D: white space is required between the macro name "CHAR_" and its replacement text   #define         CHAR_&amp;        38   This line of code is defining an ASCII value constant for an ampersand.  #define   DOL_SN        36 #define   PERCENT       37 #define   CHAR_&amp;        38 #define   RT_SING       39 #define   LF_PAR        40   I assume that this definition (not actually referenced by any code, as far as I can tell) is buggy and should be changed to something like "CHAR_AMPERSAND"? How can I check if a program exists from a Bash script? What is sudo apt-get -f install? what is the usage of apt-get -f install . when I run sudo apt-get update I got some errors at the end It says try apt-get -f install. What is this command?  the last part of my error is :   . . .   going to be installed   E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). Is there a significant difference between "rock" and "stone"? I found this pretty good small research, but I am still concerned about "regular usage" in life, say, when I am talking in the office, especially because of this comment:     To me: Stone is something you can pick up with one hand (for   throwing). A rock takes two hands. Printing a file to a printer in Ruby I know that Windows XP 32-bit can be configured, through , to support more than 3.5&nbsp;GB of RAM.  Is there a good tutorial to do this with Windows 7 32-bit?  As to why I don't simply use 64-bit Windows 7: The software for my Internet connection (cell phone-as-modem) will only work in 32-bit environments. Are there rules for falling in water vs. diving vs. just jumping in for various depths of water? Just realized that in DMing 5e I have unconsciously used a falling-in-water rule-of-thumb that I inherited from somewhere (maybe 2e or AD&amp;D or maybe even Pathfinder). The ruling I've been using is as follows:   No damage for 20 feet of falling. Half-damage next 20 feet. Normal damage beyond that.   Realizing there should be a Strength (Athletics) for "swimming" (in context, "diving") to take even less damage with a proper dive in sufficiently deep water, I started to look for specifics on that. Am I just missing it somewhere? (Also didn't find it searching this stack.)  Are there clear 5e rules for both jumping and diving in water of various depths? In chat, the short code [metaso] expands to http://meta.stacexchange.com/ (no typo, the missing 'k' is the bug I'm reporting).  (And since this is too short a bug report, I'll note that I think that [metaso] should probably point to .) How to control object's path follow speed based on its position Uses of the definite article (the) in generic noun phrases Array of zero length I am working on refactoring some old code and have found few structs containing zero length arrays (below). Warnings depressed by pragma, of course, but I've failed to create by "new" structures containing such structures (error 2233). Array 'byData' used as pointer, but why not to use pointer instead? or array of length 1? And of course, no comments were added to make me enjoy the process...  Any causes to use such thing? Any advice in refactoring those?  struct someData {    int nData;    BYTE byData[0]; }   NB It's C++, Windows XP, VS 2003 Photoshop resize circularly Is there a way to do this circular resize of a pattern in photoshop (flat image) ? (I only want to resize the green disk, without changing the size of the interior white disk and without losing details of the green disk, just flatting them)