code: def get_meirink_slope(meirink_coefs, acquisition_time):
      """Compute the slope for the visible channel calibration according to Meirink 2013.
  
      S = A + B * 1.e-3* Day
  
      S is here in µW m-2 sr-1 (cm-1)-1
  
      EUMETSAT calibration is given in mW m-2 sr-1 (cm-1)-1, so an extra factor of 1/1000 must
      be applied.
      """
      A = meirink_coefs[0]
      B = meirink_coefs[1]
      delta_t = (acquisition_time - MEIRINK_EPOCH).total_seconds()
      S = A + B * delta_t / (3600 * 24) / 1000.0
      return S / 1000
  
imports: from __future__ import annotations
  import warnings
  from datetime import datetime, timedelta
  import dask.array
  import numpy
  import pyproj
  from numpy.polynomial.chebyshev import Chebyshev
  from satpy.readers.eum_base import issue_revision, time_cds_short
  from satpy.readers.utils import apply_earthsun_distance_correction
  from satpy.utils import get_legacy_chunk_size
label_desc: Use image node_id 1 for calling a global function with example usage: get_meirink_slope(meirink_coefs, acquisition_time) and returns: unknown