[Mynameishappy]

In Masjid an-Nabawi, I noticed that the pillars in the front (Ottoman) section of the masjid are not in line with the pillars in the rest of the masjid. If you stand in the middle of the masjid, underneath the second set of umbrella things, you can see the lines of pillars stretching out in a line in front of you. The pillars in the older section at the front diverge at an angle.

Why is this? Does this mean that people in the front part of the masjid pray at a slightly different angle to the rest of the masjid?

[MadMark]

If each Saff is parallel with each other, then every one is facing correctly.
The pillars may not necessarily be aligned since the Mosque was reconstructed many times.