Identify the lines of longitude marked on the map. Provide their reference point and values.

Answer:

The lines of longitude are marked with values relative to the Prime Meridian (Гринвич):

• 0°: The Prime Meridian (Гринвич)
• К западу от Гринвича (West of Greenwich): Marked with values like 60° and 180°.
• К востоку от Гринвича (East of Greenwich): Marked with values like 60°, 120°, and 180°.

The line of 180° longitude is also visible.