Shorter exposures with a wide-angle lens can still provide enough light to show the stars in a night sky without trailing. 30-second exposure at ISO 400 on a Canon 5D DSLR at 14mm and f/8. Click photo for larger image. As mentioned before, the stars appear to move at about 1/2-degree per minute across the sky.
System Development Life Cycle Phases: 1- System Planning. The Planning phase is the most crucial step in creating a successful system, during this phase you decide exactly what you want to do and the problems youâre trying to solve, by: Defining the problems, the objectives and the resources such as personnel and costs.
Systems-Development Life Cycle. The first development methodology we are going to review is the systems-development life cycle (SDLC). This methodology was first developed in the 1960s to manage the large software projects associated with corporate systems running on mainframes.