diff --git a/rubin_scheduler/scheduler/features/conditions.py b/rubin_scheduler/scheduler/features/conditions.py
index d4c91ee..52a929d 100644
--- a/rubin_scheduler/scheduler/features/conditions.py
+++ b/rubin_scheduler/scheduler/features/conditions.py
@@ -158,8 +158,6 @@ def __init__(
             during the current night. From interpolation.
         sunrise : `float`
             The MJD of sunrise during the current night. From interpolation
-        mjd_start : `float`
-            The starting MJD of the survey.
         moonrise : `float`
             The MJD of moonrise during the current night. From interpolation.
         moonset : `float`
@@ -550,21 +548,71 @@ def set_auxtel_info(
         for key in auxtel_args.parameters.keys():
             setattr(self, key, loc[key])
 
+        potential_attrs = dir(self)
         for key in kwargs:
+            if key not in potential_attrs:
+                warnings.warn("Setting unexpected Conditions attribute %s" % key)
             setattr(self, key, kwargs[key])
 
-    def set_maintel_info(self, mjd, **kwargs):
+    def set_maintel_info(
+        self,
+        mjd,
+        slewtime,
+        current_filter,
+        mounted_filters,
+        night,
+        skybrightness,
+        fwhm_eff,
+        moon_alt,
+        moon_az,
+        moon_ra,
+        moon_dec,
+        moon_phase,
+        sun_alt,
+        sun_az,
+        sun_ra,
+        sun_dec,
+        tel_ra,
+        tel_dec,
+        tel_alt,
+        tel_az,
+        wind_speed,
+        wind_direction,
+        sun_n12_setting,
+        sun_n12_rising,
+        sun_n18_setting,
+        sun_n18_rising,
+        moonrise,
+        moonset,
+        planet_positions,
+        tel_alt_limits,
+        tel_az_limits,
+        sky_alt_limits,
+        sky_az_limits,
+        **kwargs,
+    ):
         """Method to set all the information we expect will be required by
         a standard maintel scheduler. Extra attributes can be set via **kwargs.
         """
         self._init_attributes()
 
-        maintel_args = signature(self.set_auxtel_info)
+        maintel_args = signature(self.set_maintel_info)
         loc = locals()
         for key in maintel_args.parameters.keys():
             setattr(self, key, loc[key])
 
+        potential_attrs = dir(self)
+        for key in kwargs:
+            if key not in potential_attrs:
+                warnings.warn("Setting unexpected Conditions attribute %s" % key)
+            setattr(self, key, kwargs[key])
+
+    def set_attrs(self, **kwargs):
+        """Convience function for setting lots of attributes at once."""
+        potential_attrs = dir(self)
         for key in kwargs:
+            if key not in potential_attrs:
+                warnings.warn("Setting unexpected Conditions attribute %s" % key)
             setattr(self, key, kwargs[key])
 
     def __repr__(self):
@@ -661,7 +709,6 @@ def __str__(self):
         print(positions_deg.to_markdown(), file=output)
 
         events = (
-            "mjd_start",
             "mjd",
             "sunset",
             "sun_n12_setting",
diff --git a/rubin_scheduler/scheduler/model_observatory/model_observatory.py b/rubin_scheduler/scheduler/model_observatory/model_observatory.py
index 7448b06..724058f 100644
--- a/rubin_scheduler/scheduler/model_observatory/model_observatory.py
+++ b/rubin_scheduler/scheduler/model_observatory/model_observatory.py
@@ -458,8 +458,6 @@ def return_conditions(self):
         sun_moon_info_start_of_night = self.almanac.get_sun_moon_positions(self.conditions.sunset)
         self.conditions.moon_phase_sunset = sun_moon_info_start_of_night["moon_phase"]
 
-        self.conditions.mjd_start = self.mjd_start
-
         # Telescope limits
         self.conditions.sky_az_limits = self.sky_az_limits
         self.conditions.sky_alt_limits = self.sky_alt_limits
diff --git a/tests/scheduler/test_conditions.py b/tests/scheduler/test_conditions.py
index d4b2808..908f771 100644
--- a/tests/scheduler/test_conditions.py
+++ b/tests/scheduler/test_conditions.py
@@ -1,6 +1,8 @@
 import unittest
 from inspect import signature
 
+import numpy as np
+
 from rubin_scheduler.scheduler.features import Conditions
 from rubin_scheduler.scheduler.model_observatory import ModelObservatory
 
@@ -12,16 +14,45 @@ def test_conditions(self):
         mo = ModelObservatory()
         mo_conditions = mo.return_conditions()
 
+        # Fresh empty conditions
         conditions = Conditions()
 
         # Find the arguments that need to be set
         auxtel_args = signature(conditions.set_auxtel_info)
-        
-        to_pass = {}
+
+        to_pass = []
+        for key in auxtel_args.parameters.keys():
+            if key != "kwargs":
+                to_pass.append(getattr(mo_conditions, key))
+
+        conditions.set_auxtel_info(*to_pass)
+
         for key in auxtel_args.parameters.keys():
-            to_pass[key] = getattr(mo_conditions, key)
+            if np.size(getattr(conditions, key)) == 1:
+                assert getattr(conditions, key) == getattr(mo_conditions, key)
+            else:
+                assert np.array_equal(getattr(conditions, key), getattr(mo_conditions, key), equal_nan=True)
+
+        # Again for the maintel attrs
+        conditions = Conditions()
+        maintel_args = signature(conditions.set_maintel_info)
+
+        to_pass = []
+        for key in maintel_args.parameters.keys():
+            if key != "kwargs":
+                to_pass.append(getattr(mo_conditions, key))
+
+        conditions.set_maintel_info(*to_pass)
+
+        for key in maintel_args.parameters.keys():
+            assert getattr(conditions, key) == getattr(mo_conditions, key)
+
+        # check we can set some arbitrary attributes
+        conditions = Conditions()
+        conditions.set_attrs(mjd=62511, moon_alt=0.1)
 
-        conditions.set_auxtel_info(**to_pass)
+        with self.assertWarns(Warning):
+            conditions.set_attrs(not_an_attribute=10)
 
 
 if __name__ == "__main__":