twi·light n.
1. The diffused light from the sky during the early evening or early morning when the sun is below the horizon and its light is refracted by the earth's atmosphere.
2. The time of the day when the sun is just below the horizon, especially the period between sunset and dark.
2. Dim or diffused illumination.
3. A period or condition of decline following growth, glory, or success: in the twilight of his life.
4. A state of ambiguity or obscurity.
af·ter·glow n.
1. The atmospheric glow that remains for a short time after sunset.
2. The light emitted after removal of a source of energy, especially:
1. The glow of an incandescent metal as it cools.
2. The emission of light from a phosphor after removal of excitation.
3. The comfortable feeling following a pleasant experience.
4. A lingering impression of past glory or success.
Interesting how they are both also the titles of VC songs. The seem to complement each other in imagery.