code: def _get_relative_observation_time(point, scan_params):
      line, pixel = point
      pixel = pixel + 1
      line = line + 1
      spinning_freq = 1440 * scan_params.spinning_rate
      line_step = np.floor((line - 1) / scan_params.num_sensors)
      pixel_step = (scan_params.sampling_angle * pixel) / (2 * np.pi)
      return (line_step + pixel_step) / spinning_freq
  
imports: from collections import namedtuple
  import dask.array
  import numba
  import numpy
  from satpy.utils import get_legacy_chunk_size
label_desc: Use image node_id 7 for calling a global function with example usage: _get_relative_observation_time(point, scan_params) and returns: unknown